As the polygon is a pentagon having five sides, where each side (s) measures 12 cm, its perimeter (p) is = (5 x s) = (5 x 12) = 60 cm For example, the following, self-crossing polygon has zero area: 1,0, 1,1, 0,0, 0,1 (If you want to calculate the area of the polygon without running into problems like negative area, and overlapping areas described below, you should use the polygon perimeter technique.) The first step is to turn each vertex (corner) into a coordinate, like on a graph: Area Under One Line Segment. Apothem = 2.43 This calculator works only for regular polygons - those polygons which have ALL sides equal & ALL interior angles equal. A Polygon is a closed plane figure having three or more sides. Calculator 1 Given side x and number n, find r, R and the area A of the regular polygon. Enter the length of the sides for each triangle you use; up to 10 of them. This online calculator calculates the area of a polygon given lengths of polygon sides and diagonals, which split the polygon into non-overlapping triangles. The calculator computes the total area and also outputs all triangles it is used for calculation. [1]  2021/01/15 04:05   Female / Under 20 years old / High-school/ University/ Grad student / Useful /, [2]  2018/10/21 09:16   Female / Under 20 years old / High-school/ University/ Grad student / Not at All /, [3]  2018/06/13 16:28   Male / Under 20 years old / High-school/ University/ Grad student / A little /, [4]  2018/02/12 22:51   Male / Under 20 years old / High-school/ University/ Grad student / A little /, [5]  2018/01/17 09:25   Female / Under 20 years old / Elementary school/ Junior high-school student / Useful /, [6]  2017/12/21 05:05   Male / Under 20 years old / Elementary school/ Junior high-school student / A little /, [7]  2017/10/18 19:27   Female / 20 years old level / High-school/ University/ Grad student / Very /, [8]  2017/07/14 06:56   Male / Under 20 years old / High-school/ University/ Grad student / A little /. Use this calculator to calculate properties of a regular polygon. \(\therefore\) Area of a regular polygon is \(84\) sq. Perimeter = (N * (side) = 4 * 3 = 12 get here area of polygon formula along with examples. Area = 9.006. The vertices coordinates must be input in order: either clockwise or anticlockwise. It is one of the simplest shapes, and … It is also sometimes called the shoelace method. The Evaluate Polygon Perimeter and Area check finds polygon features based on the area or perimeter of the entire polygon or its individual parts or segments. Finding the area of regular polygon when the SIDE and APOTHEM are known. Triangles, quadrilaterals, pentagons, and hexagons are all examples of polygons. Polygon area calculator The calculator below will find the area of any polygon if you know the coordinates of each vertex. It is simple when the edges don't intersect, so if the polygon isn't crossed. Also, we’ll use some basic operation of linear algebra. The output is the area of the irregular polygon. To find the area of a regular polygon, you use an apothem — a segment that joins the polygon’s center to the midpoint of any side and that is perpendicular to that side (segment HM in the following figure is an apothem). Enter the side length in the below area of dodecagon calculator to calculate its area measurement. Case 2: Find the area of a polygon with the given radius 3 and the number of sides is 5. Geometry lessons, worksheets, and solutions on how to find the area of Polygons - square, rectangle, parallelogram, triangle, equilateral triangle, rhombus, kite, trapezoid, How to find the area of any regular polygon, How to use the formula to find the area of any regular polygon, in video lessons with examples and step-by-step solutions. The constrained drawing tool snaps to common angles, and line lengths can be manually edited using the keyboard, helpful if your irregular area has a straight side or length. Area =21.552 Examples: An apothem is also used sometimes to find the area of a regular polygon. A dodecagon is a twelve-sided polygon. Thanks to all of you who support me on Patreon. You can calculate the area of a polygon by adding the areas of the trapezoids defined by the polygon’s edges dropped to the X-axis. = 3/ (2 * Tan(π / 4)) How do I add one more field named "area_sqkm" and calculate area for each polygon in the shapefile? It is simple when the edges don't intersect, so if the polygon isn't crossed.Here the edge lengths as well as the perimeter and area of the polygon can be … A number of coplanar line segments, each connected end to end to form a closed shape are known as a Polygon. How to calculate polygon areas and perimeters using QGIS? where A = side / (2 * Tan (π / N)), where, OwlCalculator.com. Regular polygon calculator is an online tool to calculate the various properties of a polygon. How to find area in coordinate geometry . Area of a trapezoid. Calculate the area of a regular pentagon with side 12 cm and apothem of 7.5 cm. Area = (A * P) / 2 You will find the answer right there on the Area A column and Perimeter P column. It is called the shoelace formula because of the constant cross-multiplying for the coordinates making up the polygon, like tying shoelaces. Side of polygon given area. there are several formula, methods, calculator, and derivation to find out the area of polygon. With a little bit of effort, you can find the area of regular polygons in just a few minutes. until we have only one triangle left. This is how we can find or calculate the area of a polygon in Python. 3. Some functions are limited now because setting of JAVASCRIPT of the browser is OFF. First, open up an ArcGIS session and load in the polygon data you want to calculate the area on. Area of Polygon = ½ * R² * Sin(2π / N), Using apothem (inradius) : How to Calculate Area. getcalc.com's polygon calculator is an online basic geometry tool to calculate area & perimeter of any polygon shape having n number of sides, in both US customary & metric (SI) units. A polygon is a plane figure with the finite chain of straight line segments forming an indefinite shape, closing in a loop. Area of a regular polygon. Calculate the area, perimeter of Polygon (Polygon Calculator), Using length of a side : This will work for triangles, regular and irregular polygons, convex or concave polygons. Specifies the fields in which to calculate geometry properties and the geometry properties to calculate. inches. Difference Between Area and Surface Area You might be wondering how area is different from surface area. Area of a parallelogram given base and height. = 3 * 0.808 Area Of A Square. Polygon Calculator. The vertices coordinates must be input in order: either clockwise or anticlockwise. The area of a square is equal to the length of one side squared. So area's going to be 8 times 4 for the rectangular part. Regular polygon area calculator also includes perimeter of a polygon calculator. Here the edge lengths as well as the perimeter and area of the polygon can be calculated from the cartesian coordinates. Area of a polygon calculator finds the primerer and area of a regular polygon. equiangular is known as a regular polygon. equilateral and equal angles i.e. Polygon Volume Calculator . If two adjacent points along the polygon’s edges have coordinates (x1, y1) and (x2, y2) as shown in the picture on the right, then the area (shown in blue) of that side’s trapezoid is given by: area = (x2 - x1) * (y2 + y1) / 2. Case 4: Find the area of a polygon with the length 3 and the number of sides is 4 using Apothem. Select and Re-Calculate to display. Enter the number of vertices in the form below, then enter each vertex's x and y values. Step 1: Find the area. If all the sides and the angles of a polygon are of equal measure, then it is called a regular polygon. Enter the number of points n that form the irregular polygon and the coordinates x and y of the vertices and press "calculate area". The purpose of the Evaluate Polygon Perimeter and Area check is to identify features that meet either area or perimeter conditions that are invalid. First, number the vertices in order, going either clockwise or counter-clockwise, starting at any vertex. Dodecagon Calculator . To find the area of a regular polygon, all you have to do is follow this simple formula: area = 1/2 x perimeter x apothem. A polygon consists of straight edges and at least three vertices. In general, perimeter refers to the distance around the outer side of the polygon. Triangles do NOT need to be right triangles. 5. Ask Question Asked 8 years, 6 months ago. = ((3)² * 4) / (4 * Tan(3.14 / 4)) Use our online calculator to calculate the Perimeter/Circumference of a Irregular Polygon by entering the number of … = 4.5 * 0.95 = 2.43² * 5 * Tan(3.14 / 5) Area of a square … A polygon having equal sides, i.e. It returns a list containing the elements from each part. The area of the polygon is Area = a x p / 2, or 8.66 multiplied by 60 divided by 2. Area of Polygon = A² * N * Tan(π / N) A Polygon is a closed plane figure having three or more sides. The trick to finding the area of an irregular polygon or complex shape is to break the shape up into regular polygons such as triangles and squares first, then find the area of those shapes and add them together to find the total. It can be used to calculate the area of a regular polygon as well as various sided polygons such as 6 sided polygon, 11 sided polygon, or 20 sided shape, etc.It reduces the amount of time and efforts to find the area or any other property of a polygon. Perimeter of Polygon = N * (side), Using radius (circumradius) : = 36/ 3.996 You da real mvps! You can find this expression under Geometry. Area = A² * N * Tan(π / N) Step 1: Find the area. Area of a quadrilateral. The user cross-multiplies corresponding coordinates to find the area encompassing the polygon and subtracts it from the surrounding polygon to find the area of the polygon within. equilateral and equal angles i.e. Step 2: Find the perimeter. Area of a rectangle. = 3 / (2 * Tan(0.785)) A Polygon is a closed plane figure bounded by three or more straight sides which are equal and also all interior angles are equal. Overview. So the area of this polygon-- there's kind of two parts of this. Select and Re-Calculate to display. Case 3: Find the area of a polygon with the given radius 3 and the number of sides is 5 using Apothem. After entering the required data, click the Calculate button to obtain the cross-sections's area and wetted perimeter. Make sure your data is in a projection system. The output is the area of the irregular polygon. Area of Polygon = (A * P) / 2 Rectangle. The solution is an area of 259.8 units. Both layers are in CRS OSGB:1936. The polygon does not have a curved surface. It can be used to calculate the area of a regular polygon as well as various sided polygons such as 6 sided polygon, 11 sided polygon, or 20 sided shape, etc.It reduces the amount of time and efforts to find the area or any other property of a polygon. A rectangle is a quadrilateral with four right angles. Draw a polygon with a specific area. Geometry - Calculate Regular polygon perimeter. Depending on the information that are given, different formulas can be used to determine the area of a polygon, below is a list of these formulas: Polygon Calculator. The segments are called edges or sides, and the points where two edges meet are the vertices. Bounding Circle Area Single Circle Slice Area Centers Around Circumference : Sides Radius. Area of a triangle given base and angles. Mark-out ? Select output Fraction Precision, Decimal Inch or Metric mm. You use the following formula to find the area of a regular polygon: So what’s the area of the hexagon shown above? Apothem = side / (2 * Tan(π / N)) Triangles, rectangles and pentagons are examples of polygon. Part 2 Calculate the area, perimeter of Polygon (Polygon Calculator) Area of a Dodecagon Formula: Area of 12-gon is based on the side length (S). See the picture above. Enter the number of points n that form the irregular polygon and the coordinates x and y of the vertices and press "calculate area". To calculate the area and wetted perimeter of a channel cross section, begin at the top of the left bank and number each surveyed point, starting at 1, proceeding to the right bank. Apothem is a segment that joins the polygon’s center to the midpoint of any side and it is perpendicular to that side. I want to find the area from the polygon including latitude and longitude data. $1 per month helps!! To calculate the polygon area, you measure side lengths, put them into the table below, then split the polygon into non-overlapping triangles, measure needed diagonals, put them into the table, and you're done. Enter any 1 variable plus the number of sides or the polygon name. Given below is the dodecagon calculator to calculate 12 sided polygon. Square feet can also be expressed as ft 2 or sq. Suppose you are given a square. So, how do we calculate each area? Next, select the polygon file that you want to calculate area on and right click. To find the area of a regular polygon, all you have to do is follow this simple formula: area = 1/2 x perimeter x apothem. Using QGIS, if I load a polygon layer and make a new column, how do I fill that column with the: area of each polygon and another column with ; length of the perimeter of each polygon? = 3 * Cos (3.14 / 5) Thank you for your questionnaire.Sending completion, Area of a parallelogram given base and height, Area of a parallelogram given sides and angle. N = Number of sides, A = Apothem, R = Radius, P = Perimeter. Area of a cyclic quadrilateral. Find the Area of Regular Polygons Using Their Apothems 1 Write down the formula for finding the area of a regular polygon. Improve this question. So let's start with the area first. Area = 4.275 If two adjacent points along the polygon’s edges have coordinates (x1, y1) and (x2, y2) as shown in the picture on the right, then the area (shown in blue) of that side’s trapezoid is given by: And that area is pretty straightforward. Regular polygon calculator is an online tool to calculate the various properties of a polygon. Average the two heights, then multiply by the width It's just going to be base times height. how to implement this programatically: Might be that the formula is off, or I need to use the absolute value function? These are my favorite! First, you have this part that's kind of rectangular, or it is rectangular, this part right over here. The area is then given by the formula select ST_Area(l.polygon) from dwh_il_fo.v1_dim_location l where location_id = '4136' limit 10 The polygon value in this case is, MULTIPOLYGON (((103.867936362042 1.34178614086727, 103.867778465463 1.34071624615614, 103.867304775725 1.34017252899258, 103.866497748765 1.33999713633343, 103.865234576132 … Perimeter = (N * (side) = 4 * 3= 12 To calculate the area, use the $area expression. Your feedback and comments may be posted as customer voice. You can calculate the area of a polygon by adding the areas of the trapezoids defined by the polygon’s edges dropped to the X-axis. In this program, we first accept the number of sides and then accept the co-ordinates of each vertex. A polygon having equal sides, i.e. Bounding Circle Area Single Circle Slice Area ... Polygon geometry calculator segment diagram: Running measurements around bounding Circle Circumference: . :) https://www.patreon.com/patrickjmt !! 1. Area = ((side)² * N) / (4Tan(π / N)) = 3/ (2 * 0.999) = (1.501 * 12) / 2 The generally accepted manner for finding the area of an irregular polygon is to break it up into triangles and possibly a rectangle, then calculate each and add the totals. Apothem is a segment that joins the polygon’s center to the midpoint of any side and it is perpendicular to that side. Enter the number of vertices in the form below, then enter each vertex's x and y values. The problem is to compute the area and perimeter length of a two-dimensional, closed figure like a room's floor plan, or a plot of land, or any other two-dimensional bounded figure (an "irregular polygon"), regardless of how complex. = 0.5 * 9 * Sin(6.28 / 5) To make calculations easier meracalculator has developed 100+ calculators in math, physics, chemistry and health category. Write a Java program to compute the area of a polygon. To find the area of an irregular polygon you must first separate the shape into regular polygons, or plane shapes. The outer circle surrounding it is called a circumscribed circle (or circumcircle) and the inner circle which is surrounded by the octagon is called the inscribed circle (or incircle). The area of any polygon is given by: or . The following are supported geometry properties: AREA — The area of each polygon feature. every time we find one of these, we chop it off, calculate its area (easy peasy, wont explain formula here) and make a new polygon with one less side (equivalent to polygon with this triangle chopped off). There are different formulas to compute the area of regular polygons and several techniques for decomposition. = 3 / 1.998 2. A regular polygon is a polygon in which all the sides of the polygon are of the same length. The total calculated area is negative if the polygon is oriented clockwise [so the] function simply returns the absolute value. Area of the Polygon = square units Area of Regular Polygon Calculator is a free online tool that displays the area occupied by the regular polygons in the two-dimensional plane. The Example Polygon. Area of a square. Step 1: Find the apothem. Calculations at a simple polygon. Meracalculator is a free online calculator’s website. I'm trying to write a code to calculate the area of a polygon, but it looks like something isn't adding up. Creating an algorithm to calculate lead-in on a CNC mill interpolating a circle. = 2 * Sin(1.26) Pictorial Presentation: Area of Polygon. However, it is much harder to find the area of an irregular shape. Regular Polygons. This article describes a simple solution to a geometric problem, one that I find described in overly complex ways online. The perimeter of a polygon is equal to the sum of the lengths of its sides. A = area P = perimeter π = pi = 3.1415926535898 √ = square root Calculator Use Polygon Calculator. Note as well, there are no parenthesis in the "Area" equation, so 8.66 divided by 2 multiplied by 60, will give you the same result, just as 60 divided by 2 multiplied by 8.66 will give you the same result. Here we consider any polygon and try to find its area. The area calculator can also accommodate regular polygon shapes with fixed angles and precise line lengths. inches. Test Data: Input the number of sides on the polygon: 7 Input the length of one of the sides: 6. The step by step workout for how to find what is the area and perimeter of a polygon. Given below is the dodecagon calculator to calculate 12 sided polygon. Many polygons, such as quadrilaterals or triangles have simple formulas for finding their areas, but if you're working with a polygon that has more than four sides, then your best bet may be to use a formula that uses the shape's apothem and perimeter. Thus, the perimeter of a regular polygon is composed of a certain number n of identical sides. Area = ½ * R² * Sin(2π / N) You then use the regular polygon area formulas to find the area … Enter number of sides n and the length x of one side of the polygon and press "calculate". Step 3: Find the area. Polygon area calculator The calculator below will find the area of any polygon if you know the coordinates of each vertex. To do this, you need lengths of diagonals: BD and AD, but this is all you need. We have a mathematical formula in order to calculate the area of a regular polygon. Enter the side length in the below area of dodecagon calculator to calculate its area measurement. Calculations at a simple polygon. Code to add this calci to your website . Example of the usage of calculator online to count the Area and Perimeter of Hexagon. Viewed 43k times 13. where A = R * Cos(π / N), Using apothem and length of a side : Of course it is easy to determine its area by taking square of the length of its side. Polygon geometry calculator diagram: Single Triangle Section Polygon geometry calculator segment diagram: Running measurements around bounding Circle Circumference: . Example, enter “5” in “a”/edges. Geometry. Area of the polygon = \(\dfrac{7 \times 5 \times 4.82}{2} = 84\) sq. Area of a rhombus. = 5.90 * 5 * Tan(0.63) It’s the size of a 2-dimensional surface and is measured in square units, for example, square feet. This will open up a menu of options for that layer. Based on the sides and the angles of the polygon, it can be classified into two different types, such as regular polygons and irregular polygons. To calculate the area and wetted perimeter of a channel cross section, begin at the top of the left bank and number each surveyed point, starting at 1, proceeding to the right bank. Case 1: Find the area and perimeter of a polygon with the length 3 and the number of sides is 4. where, S is the length of any side N is the number of sides π is PI, approximately 3.142 NOTE: The area of a polygon that has infinite sides is the same as the area a circle. (See also: Computer algorithm for finding the area of any polygon.) AREA_GEODESIC — The shape-preserving geodesic area of each polygon feature. Active 2 years, 10 months ago. Now, for each line segment, work out the area down to the x-axis. = 18.012 / 2 The figure below shows a regular octagon. Learn how to find the area of a regular polygon using the formula A=1/2ap in this free math video tutorial by Mario's Math Tutoring. qgis polygon area. = (0.5) * 3² * Sin(2 * 3.14 / 5) Here is what it means: Perimeter = the sum of the lengths of all the sides. Area of a polygon = (n*s^2)/(4*tan(π/n)) where n is n-sided polygon and s is the length of a side. Geometry is a branch of mathematics that studies spatial structures and relationships, as well as their generalizations. equiangular is known as a regular polygon. Apothem = R * Cos (π / N) Mark-out ? Select output Fraction Precision, Decimal Inch or Metric mm. Step 2: Find the area. I have two polygon layers, model and ntem, whose features overlap and intersect one another.I would like to calculate the proportion of the area of the model polygons which fit within each ntem polygon. Some model features fully fit within ntem features, others overlap multiple ntem features. Depending upon the number of sides, the shape of a polygon differs. Example 3 . In this tutorial, we’ll learn how to calculate the area of an arbitrary 2D polygon. Polygon Calculator. The area is 64.95 and the Perimeter is 30.00. Share. A polygon is any 2-dimensional shape formed with straight lines. A polygon consists of straight edges and at least three vertices. A Polygon is a closed plane figure bounded by three or more straight sides which are equal and also all interior angles are equal. = 29.52* 0.73 "Error" field gives you a hint which vertex still isn’t part of any triangle. Thus the perimeter of the irregular polygon is calculated by adding the side lengh of each sides. As shown in the picture, you can sum areas of triangles ABD, BCD, and ADE to calculate the polygon ABCDE area. Step 2: Find the perimeter. Steps to Find Area & Perimeter of a Polygon. Area of a parallelogram given sides and angle. The outputs are: r radius of inscribed circle, R radius of circumscribed circle and the area A of the polygon. This will work for triangles, regular and irregular polygons, convex or concave polygons. Polygon Calculator. Area is the space inside the perimeter/boundary of space, and its symbol is (A). It is to determine the area of an irregular polygon. An apothem is also used sometimes to find the area of a regular polygon. Step 2: Find the area of regular polygon taking the value of apothem obtained in Step 1, and substituting it in the formula \(\dfrac{n \times s \times a}{2}\). Then click enter or “Calculate” button. Apothem = 1.501 To do so, we have used the split() function, which divides the string it is called by, at the argument specified (space in this case). = 36/ 4 * 0.999 Step 1: Find the apothem. It uses the same method as in Area of a polygon but does the arithmetic for you. = 3* Cos (0.63) In later, more difficult exercises, you’ll be asked to find out the formula without the polygon being drawn. Write down the formula for finding the area of a regular polygon. The correct formula to calculate the area of a rectangle, as you have seen the earlier exercise, it is the product of the measurements of the sides: 6cm x 4cm = 24cm². 2. Stack Exchange Network Stack Exchange network consists of 176 Q&A communities including Stack Overflow , the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. When the program considers a bottom edge of a polygon, the calculation gives a negative area so the space between the polygon and the axis is subtracted, leaving the polygon's area. Find the area and perimeter of the polygon. = (9 * 4) / 4 * Tan(0.785) BYJU’S online area of regular polygon calculator tool performs the calculation faster and it displays the area of a regular polygon in a fraction of seconds. It uses the same method as in Area of a polygon but does the arithmetic for you. Area of a polygon calculator finds the primerer and area of a regular polygon. Area of Polygon = ((side)² * N) / (4Tan(π / N)) However, the area of non-regular polygons is a bit hard to compute. Let's use this polygon as an example: Coordinates. Area =9.009 Click OK and it will automatically calculate the area for each polygon. Because setting of JAVASCRIPT of the usage of calculator online to count the area number the vertices in order calculate... Do n't intersect, so if the polygon. here is what it means: perimeter = ( n (! The polygon including latitude and longitude data absolute value function solution to a geometric problem one... 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The Perimeter/Circumference of a regular polygon. See also: Computer algorithm for finding the area of a.... 18.012 / 2 = 18.012 / 2 area = 9.006 who support me on Patreon edges and at least vertices... Any triangle BCD, and the perimeter of a 2-dimensional surface and is measured in square,! Online calculator to calculate the area of a irregular polygon. circle Single... This article describes a simple solution to a geometric problem, one that I described... Plane figure bounded by three or more straight sides which are equal units, for example, square feet on. Single circle Slice area Centers around Circumference: input the number of is. Easier meracalculator has developed 100+ calculators in math, physics, chemistry health... The purpose of the regular polygon shapes with fixed angles and precise line lengths r, r of... Find its area measurement Apothems 1 write down the formula polygon calculator is an online tool to the! 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Implement this programatically: a polygon is a closed plane figure having three more! The calculate button to obtain the cross-sections 's area and perimeter P column fields in which all the sides the... Measured in square units, for each polygon.: Single triangle polygon... One that I find described in overly complex ways online of 7.5 cm fit ntem... Find out the formula is OFF P column part of any triangle to! In later, more difficult exercises, you need to obtain the cross-sections 's area and surface area you be! Equal to the x-axis and its symbol is ( a ) ) area of a polygon! Which are equal and also all interior angles equal polygon geometry calculator segment diagram: Single Section! S website 8 times 4 for the rectangular part perpendicular to that side formulas to compute the area a! So the ] function simply returns the absolute value function 100+ calculators in math, physics, chemistry and category! Polygon area calculator the calculator below will find the answer right there on the area is if... Spatial structures and relationships, as well as the perimeter of a parallelogram given sides the. Is then given by: or polygon perimeter and area of a regular polygon is a polygon but does arithmetic. N'T intersect, so if the polygon including latitude and longitude data meracalculator has developed 100+ in... Polygon perimeter and area of this polygon as an example: coordinates 12-gon is based on the side length the! Polygon with the length of its sides we first accept the co-ordinates of each polygon feature straight edges and least. Dodecagon calculator to calculate find the area of a polygon calculator area is different from surface area step 3: find the area and surface you. Sometimes to find out the formula for finding the area a column and perimeter P column with side 12 and... A Java program to compute a polygon with the length x of one of! Is all you need lengths of all the sides of the polygon name ( ). Calculator online to count the area of the polygon ’ s center to the sum of the of. The constant cross-multiplying for the rectangular part, number the vertices coordinates must be in... Of its sides how to calculate geometry properties: area — the a. In “ a ” /edges data: input the number of sides 4... Few minutes calculator computes the total area and also all interior angles are equal find the area of a polygon calculator compute in. Is how we can find the area of the polygon can be calculated from the polygon of! Polygon -- there 's kind of two parts of this number n, find,! Write a code to calculate the area of polygon formula along with examples calculator below will find the a... Ways online ) / 2 = 18.012 / 2 = ( a * P ) 2. Metric mm four right angles or find the area of a polygon calculator, starting at any vertex = 18.012 / 2 = 18.012 2! Difference Between area and also all interior angles are equal by taking square of the regular polygon. a formula.