Question

from a point on ground angle of elevation of the bottom at the top of Transmission Tower fixed at the top of 12 m high building are 40 degree and 60 degree respectively find the height of the tower​

Answer 1

Height of building  L = 20 m

Angle from top of building   theta = 45 deg

Angle from top of tank     A = 60 deg

Let the height of tank be x

Thus

tan theta = L/ B

tan 45 = 20 / B

Thus 

B = 20 m

Now

tan A = x + L / B

x + L = tan 60 * 20

x  =  20 ( root 3 - 1)