5
Answer: DSet 3: Trigonometry (Beginner)
Explanation
PROBLEM
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).
A.
13/5
B.
5/12
C.
12/13
D.✓ Correct
12/13
Detailed Explanation
Choice D is the best answer. cos = adjacent/hypotenuse = 12/13
Why others are wrong:
A: 13/5 is incorrect because it does not satisfy the equation.
B: 5/12 is incorrect because it does not satisfy the equation.
C: 12/13 is incorrect because it does not satisfy the equation.