Areas of shapes

These revision cards have been created using my notes from class

I hope they are a clear and short, to the point way to learn the formulas you need to know for exams.

Let me know what you think!

Thanks ~ Cam

HideShow resource information

Introduction

Area of shapes can seem a simple topic, but there are formulae you need to learn!

Important:

In shapes, area is always measured in mm², cm², m², etc.

1 of 5

Areas of triangles

Lets start with triangles

To work out the area of a three sided shape, use this formula:

B x H ÷ 2

(or 0.5 x B x H)

(B = base, H = height)

2 of 5

Parallelograms

Parallelograms are very simple to work out the area of.

You use the same formula that you do for most quadrilaterals:

B x H

Important:

Do not confuse the height with the side length of the parallelogram!

3 of 5

Kites

Although a kite is a quadrilateral, you have to use a different formula to work out the area:

A x B ÷ 2

(or 0.5 x A x B)

A is usually the width of the kite at its widest part; B is the height of it.

4 of 5

Trapeziums

Trapeziums have a strange formula to work out their areas.

It goes like this:

(A+B) x H ÷ 2

(or 0.5 x (A+B) x H)

A = top side length; B = bottom side length

5 of 5

Comments

daviesg

A straight forward list of basic area formulae

Similar Mathematics resources:

See all Mathematics resources »See all 2D and 3D shape resources »