## What is Perimeter?

The perimeter of a shape is the distance around the outside of the shape.

## How to Find the Perimeter

- Identify the lengths of all the sides of the shape.
- Add the side lengths together.

### Basic Shapes

### Complex Shapes

## Perimeter of Regular Polygons

Regular polygons are closed shapes with straight sides that are all the same length. Because all of the sides are the same length, the perimeter of a regular polygon can be calculated with this perimeter formula:

\[P=ns\]

The \(n\) represents the number of sides that the polygon has and the \(s\) represents the side length that all of the sides share.

### Examples

## Units of Perimeter

Perimeter is a one-dimensional measurement so the units of perimeter will always be single units like \(in\), \(m\), \(cm\), etc.

In contrast, area is measured in squared units like \(in^2\), \(m^2\), and \(cm^2\) because it is a two-dimensional measurement.

Similarly, volume is measured in cubed units like \(in^3\), \(m^3\), and \(cm^3\) because it is a three-dimensional measurement.