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Find Areas of Circles Using Their Diameters

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

'Find Areas of Circles Using Their Diameters' worksheet

Key stage:  KS 3

Curriculum topic:   Geometry and Measures

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

Difficulty level:  

Worksheet Overview

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


You must 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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