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Introduction
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In this activity, we are going to be calculating the area and perimeter of rectangles using the information provided.
The area of a rectangle is its length x width (l x w).
The perimeter of a shape is the total distance around the edge.
Area is calculated in m² or cm²
Perimeter is usually measured in m or cm
Let's have a look at an example.
Here is a rectangle (not to scale):
If the area is 200 m² and the width is 20 m, what is the perimeter?
We can work out the area using this information.
We know the width is 20 m
We know the area is 200 m²
We know that area is l x w (a = l x w)
We can divide the area by the width to find the length (a ÷ w = l)
200 ÷ 20 = 10
The length is 10 m
The perimeter will be 20 + 20 + 10 + 10 = 60 m
We can check this by multiplying 20 by 10 = 200
Top Tip: Read the information in each question carefully and use it to work out the answer. It can help to draw out the shape on paper.
Question
/ 10Mr Shepherd
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Teacher explanation