the angle of elevation of the top of a towr standing on a horizontal plane from point a is alpha.also wlking a distance towards the foot of the tower the angle of elevation is found to be beta.the height of the tower is
the angle of elevation of the top of a towr standing on a horizontal plane from point a is alpha.also wlking a distance towards the foot of the tower the angle of elevation is found to be beta.the height of the tower is