Bitesize has changed! We're updating subjects as fast as we can. Visit our new site to find Bitesize guides and clips - and tell us what you think!

Did you know?

We also have Bitesize study guides covering many subjects at National 4 and National 5 on our Knowledge & Learning BETA website.

Home > Maths I > Measure and Shape > Area and circumference of a circle

Maths I

Area and circumference of a circle

The area of a combined shape

This shape is made up of a rectangle and a semicircle.

To find the total area we just find the area of each part and add them together.

A composite shape made of a rectangle with a semicircle joined on top by its straight edge. The width of the rectangle is 20 millimetres, and the height of the rectangle is 30 millimetres.

Area of the rectangle:

= length x breadth

= 20 \times 30

= 600mm^2

Area of the semicircle:


= {1 \over 2} \pi r^2


= {1 \over 2} \times 3.14 \times 10 \times 10


= 157mm^2

Total area = 600 + 157

= 757mm^2

BBC © 2014 The BBC is not responsible for the content of external sites. Read more.

This page is best viewed in an up-to-date web browser with style sheets (CSS) enabled. While you will be able to view the content of this page in your current browser, you will not be able to get the full visual experience. Please consider upgrading your browser software or enabling style sheets (CSS) if you are able to do so.