# Compound shapes

Sometimes shapes can be more complicated. Be particularly careful to add up the lengths of every side when you work out the total perimeter.

Perimeter

In some cases you’ll need to calculate the 'missing' lengths, eg and in the question below.

Question

A plan of a play area is shown below:

a) Calculate the length of and .

b) Calculate the perimeter of the play area.

a) The length of the play area is , so .

The width of the play area is , so .

b) Perimeter .

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