Question

What is the measure of <C? Round your answer to the nearest tenth of a degree.

A 73.4
B 74.1
C 106.6
D 100.7​

Answer 1

Given:

In triangle
.

To find:

The measure of angle C.

Solution:

We have,
. It means
.

According to the law of cosines:

Taking cos inverse on both sides, we get

Therefore, the correct option is C.