year 8 maths

6C
Triangles
367
Example 3a
4 Use the angle sum of a triangle to help find the value of the pronumeral in these triangles.
a
a°
70° 30°
b
a° c
116°
24°
32°
a°
d
a°
e
a°
f
127°
a°
71°
92°
54°
17°
5 These triangles are isosceles. Find the value of a .
a
b
c
a°
a°
68°
37°
a°
80°
Example 3b
6 Find the value of a in these isosceles triangles.
a
50°
b
a°
c
a°
a°
100°
28°
Example 4
7 Find the value of a .
a
b
c
70°
a°
80°
70°
a°
130°
50° a°
d
110°
e
100°
a°
f
a°
60°
115°
a°
60°
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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