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 d = 83.0 m. In part a the person is looking at the base of the antenna, and his line of sight makes an angle of θ1 = 35.0° with the horizontal. In part b the person is looking at the top of the antenna, and his line of sight makes an angle of θ2 = 39.0° with the horizontal. How tall is the antenna?

Answer 1

Δx=83(tan 39º-tan35º)= =
=83(0.81 -0.70) =9.13 m