Set 4: Trigonometry (Beginner)

[Variation 1] **Choice C is the best answer.** cos = adjacent/hypotenuse = 12/13

Explanation

Answer: C

PROBLEM

Recent studies show that in a right triangle, the opposite side is 5, adjacent side is 12, and hypotenuse is 13. Find cos(angle).

In a right triangle, the opposite side is 5, adjacent side is 12, and hypotenuse is 13. Find cos(angle).

5/12

13/5

12/13

✓ Correct

12/13

Detailed Explanation

[Variation 1] Choice C is the best answer. cos = adjacent/hypotenuse = 12/13

Why others are wrong:

A: 5/12 is incorrect because it does not satisfy the equation.

B: 13/5 is incorrect because it does not satisfy the equation.

D: 12/13 is incorrect because it does not satisfy the equation.