Let's begin by listing out the information given to us:
Hypotenuse = 25 ft
Base = 12 ft
We have two known sides & we are to find the angle the ladder makes with the ground. We will use Trigonometric Ratio (SOHCAHTOA). In this case, CAH
Cos C = 12/25⇒ Cos C = 0.48
C = 61.3 = 61
C = 61° (to the nearest degree)