Answer:
48.6°
Step-by-step explanation:
The relation between the side of a right triangle opposite the angle, the hypotenuse, and the angle is given by ...
Sin = Opposite/Hypotenuse
sin(angle) = (15 ft)/(20 ft)
angle = arcsin(15/20) ≈ 48.6°
The angle with the ground at the base of the ladder is about 48.6°.
