Question

If b

9 and c
13, what is the measure of 2.A?(round to the nearest tenth of a degree)
34.70
11.21
16.2
19.59

Answer 1

`46.2^o`

Explanation:

The correct question is

If b = 9 and c = 13, what is the measure of ∠A? (round to the nearest tenth of a degree)

The picture in the attached figure

we know that

In the right triangle ABC

`cos(A)=(b)/(c)` ---> by CAH (adjacent side divided by the hypotenuse)

substitute the given values

`cos(A)=(9)/(13)`

using a calculator

`A=cos^(-1)((9)/(13))=46.2^o`