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.

Maths I

Area

Back

In your General Exam you may need to work out the area of any of the following shapes; rectangle, triangle, rhombus, kite and parallelogram. You may also need to work out the area of combined shapes.

Calculating the area of a rectangle or of a triangle

For all the shapes you do calculations for, make sure that you don't confuse area (the space taken up by a surface) with perimeter (the distance round the outside of a shape).

Remember that areas are measured in square units - square centimetres cm2, square metres m2 etc.

The area of a rectangle

The area of a rectangle is found by multiplying the length by the breadth.

A rectangle. The length is 6 centimetres, and the width is 3.5 centimetres.

For this rectangle:

Area = length x breadth

= 6 \times 3.5

= 21cm^2

The area of a triangle

The area of a triangle is found by multiplying 1 \over 2 by the base by the height.

A right angled triangle. The height is 5 centimetres and the base is 8 centimetres.

For the first triangle:

Area = 1 \over 2 x base x height

= {1 \over 2} \times 8 \times 5

= 20cm^2

A scalene triangle. The longest edge along the base is 10 metres. The perpendicular height, meausred at a right angle, from this base to the opposite angle is 6 metres.

For the second triangle:

Area = 1 \over 2 x base x height

= {1 \over 2} \times 10 \times 6

= 30cm^2

Back

Watch

Barry and Paul Chuckle.

Class Clips

To me, to you...the Chuckle brothers learn some useful tips for measuring area

Play

A picture of Mia Cadaver

Tombstone Timeout

Swot up your sums with Mia Cadaver's maths game

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.