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Introduction
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Read aloud
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Look at the red shape below, drawn on a centimetre square grid:
It is made of 6 centimetre squares, so its area is 6 cm2
The perimeter is the total of the distances around all four sides.
Starting at the base and going anticlockwise around the shape, we work out that:
The perimeter is 2 + 3 + 2 + 3 = 10 cm.
Now look at the blue shape below, drawn on a centimetre square grid:
It is also made of 6 centimetre squares, so its area is also 6 cm2
The perimeter is the total of the distances around all its sides.
Starting at the base and going anticlockwise around the shape, we work out that:
The perimeter is 2 + 1 + 1 + 1 + 1 + 1 + 2 + 1 + 1 + 1 + 1 + 1 = 14 cm.
Can you see that shapes with the same area can have different perimeters?
Let's try some questions.
Question
/ 10Mr Shepherd
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Teacher explanation