Question

Use ΔABC to find the value of cos B

A) 12/13
B) 12/5
C) 5/13
D) 5/12

Answer 1

C) 5/13

Explanation:

The mnemonic SOH CAH TOA reminds you that the cosine ratio is ...

Cos = Adjacent/Hypotenuse

For the given problem, this means ...

cos(B) = BC/BA = 15/39

cos(B) = 5/13