year 8 maths

6D
Quadrilaterals
375
Example 5b
4 Use the quadrilateral angle sum to find the value of a in these quadrilaterals.
a
110°
b
88°
115°
c a°
70°
a°
a°
96°
81°
84°
d
80°
35°
e
a°
230°
37°
f a°
250°
15°
a°
23°
25°
75°
5 By considering the properties of the given quadrilaterals, give the values of the pronumerals.
a 3 cm c° b cm
b 2 cm c
70°
a° 100°
b° a cm
50°
5 cm
a cm
b°
PROBLEM-SOLVING AND REASONING
6, 8 6, 8, 9
6(½), 7, 9, 10
6 Use your knowledge of geometry from the previous sections to find the values of a .
a
40°
85°
a°
27°
b
62°
a°
97°
c
22°
74°
a°
17°
d
106°
a°
e
31°
a°
f
30°
a°
55°
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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