# How to Find the Perimeter of Polygons? – Formulas and Examples

#### Table of Contents

## Introduction

### Perimeter of Polygons

In the realm of geometry, the concept of perimeter of polygons plays a crucial role in determining the total length of the boundary of a shape. When it comes to polygons, the calculation of perimeter of polygins becomes essential in various mathematical and real-world scenarios. Let’s delve into the world of polygons and understand the significance of their perimeters.

## Analogy of Definition

### What is Perimeter of Polygons?

The perimeter of a polygon is the total distance around the outside of the shape. It is calculated by adding the lengths of all the sides of the polygon. Whether it’s a regular polygon with equal sides and angles or an irregular polygon with varying side lengths and angles, the perimeter provides a comprehensive measure of the shape’s boundary.

## Method

### Calulating Perimeter of Polygons

The formula for finding the perimeter of a polygon depends on the type of polygon. For a regular polygon, the perimeter can be calculated by multiplying the number of sides (n) by the length of each side (s). The formula is given as:

For an irregular polygon**,** the perimeter is determined by adding the lengths of all the sides together. Irregular Polygons refer to those polygons in which neither are the lengths equal nor the angles.

Some common formulas for finding out the perimeter of polygons are given below.

## Examples

**Finding the Perimeter of Polygon**

Example 1 – Finding the perimeter of Hexagon with lenggth of each side equal to 8 cm.

**Step 1:** Identify the number of sides (n) and the length of each side (s)

For a regular hexagon, n = 6 (number of sides) and given length of side (s) = 8 cm

**Step 2**:Apply the formula for the perimeter of a regular polygon

Perimeter = n * s

Perimeter = 6 * 8

Perimeter = 48 cm

So, the perimeter of the regular hexagon is 48 cm.

Example 2: Perimeter of Irregular Polygon

To find out the perimeter of the figure, we will have to add the length of all sides,

Perimeter of polygon = (6 + 4 + 3 + 9) cm = 22 cm

## Quiz

## Tips and Tricks

**Formula of Perimeter of Polygon**

**Tip:**For a regular polygon, use the formula Perimeter = n * s, where n is the number of sides and s is the length of each side.

Calculation: Perimeter of a regular pentagon with n = 5 and s = 12

Perimeter = 5 * 12

Perimeter = 60 units**The Irregular Polygon Perimeter Calculation**

**Tip:**For an irregular polygon, add the lengths of all the sides to find the perimeter.

Calculation: Perimeter of an irregular hexagon with side lengths 8, 10, 12, 15, 18, and 20

Perimeter = 8 + 10 + 12 + 15 + 18 + 20

Perimeter = 83 units**The Perimeter of a Regular Octagon**

**Tip:**For a regular octagon, calculate the perimeter by multiplying the number of sides by the length of each side.

Calculation: Perimeter of a regular octagon with n = 8 and s = 14

Perimeter = 8 * 14

Perimeter = 112 units**The Perimeter of an Irregular Quadrilateral**

**Tip:**For an irregular quadrilateral, simply add the lengths of all the sides to determine the perimeter.

Calculation: Perimeter of an irregular quadrilateral with side lengths 6, 8, 10, and 12

Perimeter = 6 + 8 + 10 + 12

Perimeter = 36 units-
**The Perimeter of a Regular Decagon**

**Tip:**For a regular decagon, use the formula Perimeter = n * s, where n is the number of sides and s is the length of each side.

Calculation: Perimeter of a regular decagon with n = 10 and s = 9

Perimeter = 10 * 9

Perimeter = 90 units

## Real life application

**Story: “Maya and Ethan Find the Perimeter of Polygon”**

Maya and Ethan, two young explorers, embarked on a quest that led them to various challenges where the concept of perimeter of polygon played a crucial role in their success.

**Challenge 1: The Maze Escape**

In their adventure, Maya and Ethan encountered a mysterious maze with irregular polygon-shaped walls. To find their way out, they had to calculate the perimeter of the maze and identify the shortest path. By adding the lengths of the sides, they determined the total perimeter and successfully navigated through the maze.

**Challenge 2: The Treasure Map**

As they ventured further, Maya and Ethan discovered a treasure map that led them to a hidden cave. The map indicated the location of the treasure within a regular hexagon-shaped area. By calculating the perimeter of the hexagon, they determined the boundary of the treasure site and uncovered the hidden riches.

**Challenge 3: The Bridge Crossing**

In their final challenge, Maya and Ethan encountered a series of bridges with irregular polygon-shaped arches. To cross safely, they needed to calculate the perimeter of each bridge arch and identify the sturdiest path. By applying their knowledge of perimeter, they successfully crossed the bridges and completed their quest.

## FAQ's

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