Page 162 - Cambridge+Checkpoint+Mathematics+Coursebook+9

17.1 Using bearings

t o
me
his is par
w
k.
s ho
ai’
f
Dakar
o
T
5 This is part of Dakarai’s homework.
r
Question i Write down the bearing N
of B from A. N N
ii Work out the bearing N
of A from B. A 127° 127°
A
B 180°
127° B
Answer i Bearing of B from A is 127°.
ii Bearing of B from A is 180° + 127° = 307°.

Dakarai knows that any two north arrows are always parallel so
he uses alternate angles to work out the bearing of A from B.
For each of these diagrams: a N b N c N
i write down the bearing of B from A N
ii work out the bearing of A from B. N
N
B A 118° B
77°
A
B 16°
6 This is part of Harsha’s homework. A
Not drawn accurately

Question i Write down the bearing N
of P from Q. N
ii Work out the bearing N
of Q from P. Q
N
223°
Q
180°
P
43° 43°
Answer i Bearing of P from Q is 223°.
P
ii Bearing of Q from P is 223° – 180° = 043°.

Harsha uses alternate angles to work a b N c
out the bearing of Q from P. N N
For each of these diagrams: N N
i write down the bearing of P from Q N
ii work out the bearing of Q from P. Q P Q Q
P 244° 348° 204°
P

17 Bearings and scale drawing 161