Question

A 21-foot ladder is leaning against a building. The base of the ladder is 7 feet from the base of the building.

To the nearest degree, what is the measure of the angle that the ladder makes with the ground?

Answer 1

x - the measure of the angle that the ladder makes with the ground


`cos(x)= (7)/(21) \\ \\ cos(x)= (1)/(3) \\ \\ x=\arccos{(1)/(3) } \approx 71^o`