Question

a man standing on the bank of the river observes the angle of elevation of the top of a building of an organisation is 60°.when he moves 40m away from the bank he find the angle of elevation to be 45°find the height of building

Answer 1

In ΔABD,
             tan 45°=h÷40
                  1=h÷40
                  40=h
 ∴height of the building is 40m