Question

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Triangle ABC has three sides with these lengths: AB = 9, BC = 40, and CA = 41. What is the value of cos C?

A. 9/41

B. 40/9

C. 40/41

D. 9/40

Answer 1

Cos = adjacent/hypotenuse
just correcty identify the angle in question and the side adjacent to the angle. Cos of that angle will be equal to the lentgh of the adjacent side divided by the hypotenuse of the triangle.(hypotenuse should be the longest side)

Answer 2

Yes, start by drawing a figure according to the numbers, and use the definition of cosine to determine the values.