A clinometer is a tool that is used to measure the angle of elevation, or angle from the ground, in a right - angled triangle. We can use a clinometer to measure the height of tall things that you can’t possibly reach to the top of, flag poles, buildings, trees. Ravish got a clinometer from school lab and started the measuring elevation angle in surrounding. He saw a building on which society logo is painted on wall of building. From a point P on the ground level, the angle of elevation of the roof of the building is 45 degree. The angle of elevation of the centre of logo is 30 degree from same point. The point P is at a distance of 24 m from the base of the building