A man is 1.6m tall. He stands 20m away from the wall of a house. if the man raise his eyes at an angle of 12 to see the bottom of the window and the top of the window is 83m away from the man's eye. calculate,
a. the angle of the elevation through which the man must raise his eye to see the top of the window.
b. the height of the wall from the top of the window to the ground.
c. the height of the window.​