**Applications of Trigonometry Heights and Distances Chapter 9 Exercise 9.1 Question 7**

**7.** From a point on the ground, the angles of elevation of the bottom and the top of a transmission tower fixed at the top of a 20 m high building are 45 and 60 respectively. Find the height of the tower.

**Solution:**

It is given that tower (AD) is fixed at the top of 20 m high building (DC).

In , we have

m

In , we have

m

**Length of tower (AD) = AC - DC =** m