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Find Circumferences and Areas of Circles Using a Calculator

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

'Find Circumferences and Areas of Circles Using a Calculator' worksheet

Key stage:  KS 3

Curriculum topic:   Number

Curriculum subtopic:   Use Calculators/Technology for Accuracy

Difficulty level:  

Worksheet Overview

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

 

You must learn the two important formulae below to find 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.

 

Answers

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)

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