Set 3: Trigonometry (Intermediate)

[Variation 3] **Choice A is the best answer.** cos = adjacent/hypotenuse = 4/5

Explanation

Answer: A

PROBLEM

Researchers have observed that in a right triangle, the opposite side is 3, adjacent side is 4, and hypotenuse is 5. Find cos(angle).

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

4/5

✓ Correct

5/3

4/5

3/4

Detailed Explanation

[Variation 3] Choice A is the best answer. cos = adjacent/hypotenuse = 4/5

Why others are wrong:

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

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

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

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