# Find the Area of Shaded Circular Rings

In this worksheet, students will calculate the area of shaded circular rings.

Key stage:  KS 3

Curriculum topic:   Geometry and Measures

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

Popular topics:   Area worksheets, Geometry worksheets

Difficulty level:

#### Worksheet Overview

The formula for the area, A, of a circle in terms of its radius, r, is given by:

A = πr2

In this activity, we will use the pie symbol on our calculators in our calculations.  If you do not have a scientific calculator, you can always use one online.

To work out the shaded area shown below, we must work out the area of the outer circle and subtract the area of the inner circle.

Example

Calculate the shaded area in cm2 between the two circles shown below.

Area of outer circle = π x 92 = 81π

Area of inner circle = π x 82 = 64π

Shaded area = 81π - 64π = 17π = 53.38 cm2

= 53.4 cm ² (3 s.f.)

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