Question : The thread of a kite makes an angle of 60° with the horizontal plane. If the length of the thread is 80 m, then the vertical height of the kite will be:

Question : If the angle of elevation of the sun decreases from $45^\circ$ to $30^\circ$, then the length of the shadow of a pillar increases by 60 m. The height of the pillar is:

Question : The angle of elevation of an aeroplane as observed from a point 30 metres above the transparent water surface of a lake is 30° and the angle of the depression of the image of the aeroplane in the water of the lake is 60°. The height of the aeroplane from the water

Question : A telegraph post is bent at a point above the ground. Its top touches the ground at a distance of $8\sqrt{3}$ metres from its foot and makes an angle of $30^{\circ}$ with the horizontal. The height (in metres) of the post is:

Question : The upper part of a tree broken at a certain height makes an angle of 60° with the ground at a distance of 10 metres from its foot. The original height of the tree was: