# Why are my polygon features area being calculated as zero?

Geographic Information SystemsContents:

## How do you find the area of a polygon?

The formula to calculate the area of a regular polygon is, **Area = (number of sides × length of one side × apothem)/2**, where the value of apothem can be calculated using the formula, Apothem = [(length of one side)/{2 ×(tan(180/number of sides))}].

## How do you find the area of a polygon in Arcgis?

Quote from video: *And do a right-click you have an option called calculate geometry click on the option by default property is area leave it like that because you want to calculate area of that polygon.*

## How do you find the area of a shape in Arcmap?

**Calculating area, length, and other geometric properties**

- Start an edit session.
- Right-click the layer and click Open Attribute Table.
- Right-click the field heading for which you want to make a calculation and click Calculate Geometry.
- Click the geometric property you want to calculate.

## What is the easiest way to find the area of a regular polygon?

Quote from video: *To one of the sides. Okay. So when you drop this perpendicular. Here okay it's gonna be at a right angle. And it's also gonna bisect that side it's gonna cut it in half now what's a regular polygon.*

## How do you find the area of a polygon with 4 sides?

If the diagonal and the length of the perpendiculars from the vertices are given, then the area of the quadrilateral is calculated as: **Area of quadrilateral = (½) × diagonal length × sum of the length of the perpendiculars drawn from the remaining two vertices**.

## How do you find the area of a shapefile?

Quote from video: *We can find it manually or we can filter from here as my projected coordinate system is utm zone 44 nert i will be typing 44 not here.*

## How do you find the area of a polygon with 10 sides?

What is the Formula to Find the Area of a Regular Decagon? The formula to determine the value of the area of a decagon is **5a ^{2}/2 × √5+2√5 5 + 2 5** , where ‘a’ is the side length of the decagon.

## What is the area of a normal polygon?

The formula for calculating the area of a regular polygon is **A = (n/2) * L * R**, where n is the number of sides in the polygon, L is the length of one side of the polygon, and R is the radius of an inscribed circle.

## What is the formula for a polygon?

Polygon Formula

**The sum of interior angles of a polygon with “n” sides =180°(n-2)** Number of diagonals of a “n-sided” polygon = [n(n-3)]/2. The measure of interior angles of a regular n-sided polygon = [(n-2)180°]/n. The measure of exterior angles of a regular n-sided polygon = 360°/n.

## How do you find the area of a polygon with sides?

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**. Here is what it means: Perimeter = the sum of the lengths of all the sides. Apothem = a segment that joins the polygon’s center to the midpoint of any side that is perpendicular to that side.

## What is the formula for area of a irregular polygon?

To find the area of an irregular shape, we first break the shape into common shapes. Then we find the area of each shape and add them. For example, if an irregular polygon is made up of a square and a triangle, then: Area of irregular polygon = **Area of Square + Area of Triangle**.

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