Applications of Trigonometry Heights and Distances Chapter 9 Exercise 9.1 Question 13
13. As observed from the top of a 75 m high lighthouse from the sea-level, the angles of depression of two ships are and . If one ship is exactly behind the other on the same side of the lighthouse, find the distance between the two ships.
It is given that height of lighthouse (AB) = 75 m
We want to find distance between two ships which is CD.
Therefore, the Distance between two ships (CD) = BD - BC = m