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Perimeter: What Does One Side Measure?

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

'Perimeter: What Does One Side Measure?' worksheet

Key stage:  KS 2

Year:  Year 3 11+ worksheets

Curriculum topic:   Maths and Numerical Reasoning

Curriculum subtopic:   Perimeter and Area

Popular topics:   Area worksheets

Difficulty level:  

Worksheet Overview

This worksheet is about the perimeter of regular 2D shapes. These are polygons whose sides are all equal in length.

The perimeter is the total distance around the outside of a 2D shape. 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 (decagon).

If the length of 10 equal sides add 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.

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