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In a right triangle with hypotenuse 13 and opposite (to A) = 5, what is cos A?

A12/13
B13/12
C5/12
D5/13
Answer & Solution
Correct answer: A. 12/13
Adjacent² = 13² − 5² = 169 − 25 = 144, so adjacent = 12. cos A = adjacent/hypotenuse = 12/13.
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