Question #N826
The lengths of the sides of a right triangle are 5, 12, and 13. What is the cosine of the angle opposite the side with length 12?
A. 5/13
B. 12/13
C. 5/12
D. 12/5
Correct Answer is: A
In a right triangle, the cosine of an angle is the ratio of the length of the adjacent side to the length of the hypotenuse. The side opposite the angle with length 12 is the side with length 5, and the hypotenuse is the side with length 13. Therefore, the cosine of the angle opposite the side with length 12 is 5/13.