Question

Find Cos(A)

Cos(A)=


a. 3/5


b. 4/5


c. 5/3


d. 5/4


e. 3/4


f. 4/3

Answer 1

b. 4/5

Explanation:

You want the cosine of angle A in the given right triangle.

Cosine

The mnemonic SOH CAH TOA reminds you of the trig ratios.

Cos = Adjacent/Hypotenuse

The side adjacent to angle A is AB = 4. The hypotenuse is AC = 5. The cosine ratio is ...

cos(A) = AB/AC

cos(A) = 4/5 . . . . matches choice B

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