ANGLE OF ELEVATION

The angle of elevation of the top of a tower from a point on the same level as the foot of tower is phi . On moving 'a' mctrcs towards the foot of tower, the angle of elevation becomes 45^(@) and again on moving b metres in the same dorection, the angle of elevation becomes (90^(@)-phi) . Find the height of the tower.

The heights of two towers are 210 metres and 70 metres respectively. If the angle of elevation of the top of the first twoere form the bottom of the second tower be 60^@ , then find the angle of elevation of the top of the scecond tower from the bottom of the first tower.

The Heights of two tower are 180 metres and 60 metres respectively. If the angle of elevation of the top of the first tower from the foot of the second tower is 60^(@) . Calculate the angle of elevation of the top of the second tower from the foot of the first.

Which are the angles of elevation?