From the top of a cliff 20 m high the angle of elevation of the top of the Tower is found to be equal to the angle of depression of the foot of the tower. The height of the tower is
A) 20
B) 40
C) 60
D) 80
From the top of a cliff 20 m high the angle of elevation of the top of the Tower is found to be equal to the angle of depression of the foot of the tower. The height of the tower is
A) 20
B) 40
C) 60
D) 80