At a point horizontal to the foot of a mountain, the angle of elevation of its summit is found to be a . After ascending 'a' meters towards the mountain up a top of inclination B, then angle of elevation is found to be y. The height of the mountainis answer only in terms of sine

A) C) B D a sin a sin (y +ß) sin(y- a) a sin a sin (y +B) sin(y+a) At a point horizontal to the foot of a mountain, the angle of elevation of its summit is found to be a . After ascending 'a' meters towards the mountain up a top of inclination B, then angle of elevation is found to be y. The height of the mountainis a sin a sin (y- ß) sin(y- a) a sin a sin (y- B) sin(y+a)

From a point on the ground the angle of elevation of top of a tower is α. On moving 'a' meter towards the tower, the elevation changes to β. The height of the tower is:

the angle of elevation of the top of the tower standing on a Horizontal plane from a pont A is α and after walking distance d towards it the amgle of elevation is β the height of tower is

Angle of elevation measured for a tower erected over a building from a point of aninstrument located on the ground was 12° and 9° for the top and bottom of the towerrespectively. The height of the tower is 9 m. If the angle at depression of plinth level ofthe building from the same instrument is 4°, calculate the height of the building. (7Marks)

The angle of elevation of the top of a tower at a point X is 30°. On walking 30 m towards the tower if the angle of elevation becomes 60° at point Y, find the height of the tower?