year 8 maths

5A
Introducing ratios
279
ENRICHMENT
– –
19–21
Area ratios
19 Using the dimensions provided, find the ratio of the shaded area to the unshaded area for each of
the following diagrams.
a
10 cm
b
20 cm
4 cm
2 cm
5 cm
15 cm
Triangles:
base = 10 cm
height = 9 cm
c
d
4 cm
30°
50°
8 cm
20 Estimate the ratio of the shaded floor to the unshaded floor in this photo.
21 Design your own diagram for which the ratio of shaded area to unshaded area is:
a 1 : 3 b 1 : 7
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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