year 8 maths

6A
The language, notation and conventions of angles
351
■ This diagram shows two angles sharing a vertex and an arm. They are
called adjacent angles.
C
A
B
D
Key ideas
■ This diagram shows two angles in a right angle. They are adjacent
complementary angles. a° is the complement of b° .
a + b = 90
a°
b°
■ It is possible to have three or more angles in a right angle.
They are not complementary.
d + e + f = 90
d°
e°
f °
■ This diagram shows two angles on a straight line. They are
adjacent supplementary angles. g° is the supplement of h° .
g + h = 180
g° h°
■ It is possible to have three or more angles on a straight line. They are
not supplementary.
i + j + k = 180
j°
i°
k°
■ This diagram shows angles at a point and angles in a revolution .
p + q + r + s = 360
p° q°
s°
r°
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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