Triangle ABC has side lengths a=74.1, b= 60.8, c=114.2. What is the measure of angle C? a. 35.9°
b. 28.8°
c. 96.4°
d. 115.3°

Given:

In triangle ABC, a=74.1, b= 60.8, c=114.2.

To find:

The measure of angle C.

Solution:

According to the Law of cosine:

Substituting , we get

Taking cos inverse on both sides, we get

Therefore, the correct option is d.

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step-by-step explanation:

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