Apps. and Interpretation for IBDP Maths Ebook 1 | Page 159

Exercise 42
1. In the figure, A and B are two points on the same horizontal ground. The angles of
elevation of a cable car P from A and B are 45 and 34 respectively. C is a point on
AB which is vertically below P . AB � 120 m and A , B and C lie on the same vertical
plane.
13
(a) Find the size of the angle ˆ APB .
(b)
Find the length of PB.
(c) Find the length of PC .
[2]
[3]
[2]
2. In the figure, a vertical lamp post PQ stands on an inclined straight road. The inclined
road makes an angle of 24 with the horizontal. R is a point on the road and 5 m away
from Q . The angle of elevation of P from R is 69 .
(a) Find the size of the angle ˆ PRQ .
(b) Find the size of the angle ˆ QPR .
(c) Find the length of PQ .
[2]
[2]
[3]
www.seprodstore.com
149