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Use the Perimeter to Find the Length of One Side

In this worksheet, students will calculate the length of one side of a regular polygon by first counting the number of sides and then dividing.

'Use the Perimeter to Find the Length of One Side' worksheet

Key stage:  KS 2

Year:  Year 3 Maths worksheets

Curriculum topic:   Measurement

Curriculum subtopic:   Measure 2D Shapes

Difficulty level:  

Worksheet Overview

This activity is about finding the perimeter of regular 2D shapes. A regular shape is a polygon with sides that are all equal in length.


The perimeter is the total distance around the outside of a 2D shape. We can calculate the perimeter by adding together all the lengths of the sides.



What is the length of one side?


Perimeter: 70 cm



First, count the number of sides.

There are 10 in this regular shape. It is a decagon.


If the length of 10 equal sides adds to 70 cm, we can divide to find the length of one side.

70 ÷ 10 = 7

Each side is 7 cm long.


Remember to put cm in the answer.


Let's have a go at some questions now.


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