year 8 maths

3A
Length and perimeter
123
11 Gillian can jog 100 metres in 24 seconds. How long will it take her to jog 2 km ? Assume Gillian
can keep jogging at the same rate and give your answer in minutes.
12 A rectangular picture of length 65 cm and breadth 35 cm is surrounded by a frame of breadth 5 cm .
What is the perimeter of the framed picture?
13 Write down rules using the given letters for the perimeter of these shapes (e.g. P = a + 2b ).
Assume that all angles that look right angled are 90° .
a b b a
c
a
b
b
a
d
a
e
a
f
a
b
b
b
14 These shapes have perimeter P. Write a rule for x in terms of P (e.g. x = P − 10 ).
a
x
4
b
c
3
7
2
x
x
d 4
e
f
x
x
x
Cambridge Maths NSW
Stage 4 Year 8 Second edition
ISBN 978-1-108-46627-1 © Palmer et al. 2018
Cambridge University Press
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