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.

Key stage: KS 3

Curriculum topic: Number

Curriculum subtopic: Use Calculators/Technology for Accuracy

Difficulty level:

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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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