From the window 64 meters above the ground, the angle of elevation to the top of the building right across the street is 55° while the angle of depression to the base of the building is O.
a. What is the angle of depression of the tall building from the window?
b. How far is the taller building from the window of the observer?
c. What is the height of the taller building?
d. What is the distance from the window of the observer to the top of the taller building?