  # Find the Circumference and Area of a Circle

In this worksheet, students will find the circumferences and areas of circles given their radii. They use a calculator to work out their answers. Key stage:  KS 3

Curriculum topic:   Number

Curriculum subtopic:   Use Calculators/Technology for Accuracy

Popular topics:   Area worksheets

Difficulty level:   #### Worksheet Overview

This activity is about finding the circumferences and areas of circles using a calculator.

We need to learn the two important formulae below using the radius of a circle (r)

Circumference of a circle = 2 π r

Area of a circle = π r2

Examples

Find the circumference and area of a circle of radius 6 cm.

π is usually taken to be 3.142, but your calculator should have the π button on it which will make your calculations more accurate. Once you've done the first part of the calculation, just tap in x π and then = and you should get the correct answer. Test it out with the examples below!

Circumference = 2 π r = 2 x π x 6 = 12 x π = 37.7 cm  (1 dp)

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

On to the questions now!

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