Answer:
a) About 40° and 5 °; b) the height of the person; c) none
Explanation:
(a) Angles of depression and elevation
The angle of depression is about 40°.
The angle of elevation is about 5°.
(b) Dependence of angles
The angles of elevation and depression depend on the height of the person.
The taller the person, the smaller the angle of elevation and the larger the angle of depression.
(c) Limitations of angles
There is no chance that either angle could be greater than or equal to 99°.
Each is part of a right triangle.
If one angle is a right angle, each of the other two angles must be less than 90°.