Find Areas of Circles Using Their Radiuses

In this worksheet, students find the areas of circles given their radiuses.

Key stage: KS 3

Curriculum topic: Geometry and Measures

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

Difficulty level:

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Worksheet Overview

QUESTION 1 of 10

This worksheet is about finding the areas of circles.

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

Area of a circle = π r²

What is pi (π) in numbers? Pi is an infinite number, and you can use a function on your calculator to input the number.

Here is the start of it - 3.14159265359...

In this activity, you will need to use a scientific calculator to calculate the answers. You can use one online if you do not have one in your home.

Example

Find the area of a circle of radius 6 cm.

Answer

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

Remember, in this activity, you need to use a scientific calculator to calculate pi correctly, you can access one of these online.

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