Answer:
Step-by-step explanation:
SOHCAHTOA
Cosine = Adjacent / Hypotenuse (Hypotenuse is the side opposite from the right angle)
The Hypotenuse is BT which has a measure of 25
Legs are the two sides that are not the Hypotenuse.
The adjacent leg to Angle B is SB which has a measure of 20.
Plug the measures in to get SinB = 20/25
