Perimeter


1. Choose the correct answer. Perimeter is: a) The measure of the space contained inside a shape b) The measure of the space outside a shape c) The measure of the total length of the sides of a shape


2. Mr Baker the baker made some unusually shaped birthday cakes and now he doesn’t know what length of ribbon he needs to tie around each of the cakes. Can you help him? He needs to fi nd the perimeter of each of the cakes and he needs an extra 13cm per cake to tie the ribbon.


23cm 19cm 25cm 23cm 18cm 17cm 15cm


Puzzler Do you remember what a regular polygon is? Is it:


a) A shape that has the same number of sides as angles? b) A shape whose sides are of equal length? c) A shape that has more than 4 sides?


(Hint: a square is a regular polygon.)


If we know the length of a side of a regular polygon, what would be a quick way of working out the perimeter?


3. Find the perimeters of these regular polygons. Shape


Square


Octagon Pentagon Decagon


Equilateral triangle Heptagon Nonagon Hexagon


140 Length


Length of side Number of sides 28.6cm 7.37m 35.2cm 4m 6cm 436mm


9cm 8mm 2.83m


8m 24cm Perimeter 19cm 8cm 11cm 17cm


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