year 8 maths

Chapter review
397
5 These triangles include exterior angles. Find the value of a .
a
85°
a°
152°
b
a°
70° 71°
c
140°
145°
a°
6 Find the value of a and b in these quadrilaterals.
a
b
b°
b°
a°
82°
79°
a°
95°
c
47°
30°
a° b°
52°
7 How many axes of symmetry do the following shapes possess?
a rectangle b parallelogram c square d kite
8 What is the order of rotational symmetry for these shapes?
a rectangle b parallelogram c square d equilateral triangle
9 Find the value of a .
a
a°
38°
b
a°
40°
c
a°
a°
60°
10 Find the value of x in this diagram.
30° 70° x°
Extended-response questions
1 Find the value of a , giving reasons.
A
a°
50°
B
E
70°
D
C
2 Find the size of ∠ ABE , giving reasons.
A
B
3 In the diagram, ABDE is a rectangle.
AB = 5 cm, AE = 8 cm, EC = 13 cm .
Find the value of a , giving reasons.
A
C
130°
D
B
E
E
D
a°
C
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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