1. C. Cosine

2. B. Right Triangle

• The correct answer is 19.47°. The six trigonometric functions are defined as ratios of sides in a right triangle. Their values depend only on the angle and not on any particular right triangle. A good way to remember the definitions of sine, cosine, and tangent is with the memory device sohcahtoa.

3. B. Hypotenuse

• The hypotenuse of a right triangle is always the side opposite the right angle. It is the longest side in a right triangle.