# Calculating polygon area using 2 methods in QGIS

Geographic Information SystemsContents:

## How do you calculate the area of a polygon on QGIS?

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?

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.

## How do you create an area in QGIS?

Open QGIS and create a new blank project. **Navigate to and click on the menu entry Layer ► Create Layer ► New Shapefile Layer**. You’ll be presented with the New Shapefile Layer dialog, which will allow you to define a new layer.

Dec 15, 2022

## How do you find the area of a 2d 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 shape in GIS?

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 measure area in GIS?

**Steps**

- Click the Measure tool. on the Tools toolbar.
- Click the Measure A Line button or the Measure An Area button .
- Sketch the desired shape on your map.
- Double-click when you want to end the line or polygon, and the measurements are displayed on the Measure dialog box.

## What is the formula of polygon method?

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.

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

Quote from video: *But the question is is how do we find the area let's look at a couple examples. And I'll show you how this works so we're gonna write down our formula area equals one-half apothem times perimeter.*

## How can you find the area of an irregular polygon using formulas?

Quote from video:

## What is the difference between area and $area in QGIS?

I know that the difference between area() and $area in QGIS 3.10 is that **the first is calculated planar and the second with ellipsoid**.

Jan 13, 2020

## Can you calculate area of raster in QGIS?

**The function get_raster_area is used to calculate the total area of the raster**. This is achieved by getting the total area of each cell and then multiply by the number of cells in the coverage raster. The function get_area calculates the total area of each color range by using the NumPy.

Sep 14, 2020

## How to calculate geometry in QGIS?

**This can be done very easily with the Field Calculator tool.**

- Open Field Calculator. Open the field calculator by clicking the icon on the attribute table toolbar.
- Define Name and Data Type for a New Field.
- Enter an Expression to Calculate Geometry.
- Run the Expression.
- Turn off Editing Mode.

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