Finding the Area of a Rectangle

1
Finding the Area of a Rectangle
2

• Objectives
• To calculate areas of rectangles
• To calculate areas of polygons made of rectangles

3
Area is the measure of how much space a shape
takes up. We measure it in squares such as
square centimetres or metres etc.
This rectangle takes up 28 squares. It has an
area of 28 square centimetres 28 cm2
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
4
It could take a long time to cover shapes in
squares. Luckily there is an quicker way.
7 cm
4 cm

28 cm2
5
Use this formulae to find the area of rectangles.
length
breadth
Area of a rectangle length breadth
6
Can you find the areas of these rectangles?
15 cm2
14 cm2
49 m2
7
Can you think of a way to find the area of this
shape?
5 cm
6 cm
7 cm
3 cm
12 cm
8
Split the shape into rectangles?
5 cm
6 cm
7 cm
3 cm
12 cm
9
Find the area of each rectangle?
5 cm
5 6 30 cm2
7 3 21 cm2
6 cm
7 cm
3 cm
10
Add the areas together to find the area of the
complete shape?
30 21 51 cm2
30 cm2
21 cm2
11
Can you find the areas of these shapes?
6 m
22 m2
3 m
4 m
43 cm2
1 m
4 m
12
Here is a challenge can you work out the area of
this shape with a hole in it?
2 cm
5 cm
5 cm
10 cm
Clue Take the area of the hole from the area of
the whole!
50 cm2 10 cm2 40 cm2
13
Remember Area of a rectangle length breadth
length
breadth
Split more complicated shapes into rectangles and
find the area of each rectangle then add them
together.
Over to you.