Question

In Fig. 11.45, from the top of a building AB,60 metres high. the angles of depression of the top and bottom of a vertical lamp post CD are observed to be 30º and 60º, respectively. Find
(i) the horizontal distance between AB and CD.
(ii) the height of the lamp post.

Answer 1

Given AB is the building and CD is the vertical lamp post. Then, DE is the horizontal distance between AB and CD.Let CD =h metres. Then