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Perimeter
The perimeter is the total distance around a shape, starting and finishing at the same point.
Example
Here the perimeter is 1 + 2 + 1 + 1 + 2 + 3 = 10 cm
Area
Remember that the area of a rectangle is length x width.
Example
If we have a rectangle with a width of 4 m and a length of 6 m
The area will be 4 m x 6 m = 24 m2
Calculate a missing length
If we know the area and one side, we can divide to find the length of the other side.
Example
A rectangular room has an area of 12 m2
If its length is 4 m, what is its width?
We divide 12 ÷ 4 = 3
So the width = 3 m
