The drawing shows a person looking at a building on top of which an antenna is mounted. The horizontal distance between the person's eyes and the building is L = 98.1 m.
part (a) the person is looking at the base of the antenna, and his line of sight makes an angle of ?a = 31.9° with the horizontal.
part (b) the person is looking at the top of the antenna, and his line of sight makes an angle of ?b = 34.4° with the horizontal. How tall is the antenna?