Set 1: Trigonometry (Beginner)

**Choice A is the best answer.** cos = adjacent/hypotenuse = 4/5

Explanation

Answer: A

PROBLEM

In a right triangle, the opposite side is 3, adjacent side is 4, and hypotenuse is 5. Find cos(angle).

4/5

✓ Correct

4/5

5/3

3/4

Detailed Explanation

Choice A is the best answer. cos = adjacent/hypotenuse = 4/5

Why others are wrong:

B: 4/5 is incorrect because it does not satisfy the equation.

C: 5/3 is incorrect because it does not satisfy the equation.

D: 3/4 is incorrect because it does not satisfy the equation.