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Find the Areas of Circles Using Their Diameters

In this worksheet, students will work out the areas of circles given their diameters.

'Find the Areas of Circles Using Their Diameters' worksheet

Key stage:  KS 3

Year:  Year 9 Maths worksheets

Curriculum topic:   Geometry and Measures

Curriculum subtopic:   Solve Problems Involving Perimeters and Areas of 2D Shapes

Popular topics:   Area worksheets, Geometry worksheets

Difficulty level:  

Worksheet Overview

This activity is about finding the areas of circles, given their diameters.


You need to learn this important formula for a circle of radius, r :


Area of a circle = π r2


Remember that the radius is half the diameter.



Find the area of a circle of diameter 12 cm.



First, work out the radius, which will be 12 ÷ 2 = 6 cm

Area = π r2 =  π x 62 = π x 36 = 113.1 cm2  (1 dp)


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