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Find the Perimeter of a Regular Polygon

In this worksheet, students will work out the perimeter of a regular 2D polygon.

'Find the Perimeter of a Regular Polygon' worksheet

Key stage:  KS 2

Year:  Year 3 Maths worksheets

Curriculum topic:   Measurement

Curriculum subtopic:   Measure 2D Shapes

Difficulty level:  

Worksheet Overview

In this activity, we will be working out the perimeter of a regular 2D polygon.


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

Remember that in a regular polygon, all the sides are the same length.



Calculate the perimeter of the shape.


 3 cm 


First, count the number of sides.

There are 5 sides in this shape. It is a pentagon.


It is regular so each side is 3 cm long.

The perimeter is 5 x 3 = 15 cm


Remember the answer is 15 cm not just 15!


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