The cosine rule calculate tha angle of r 7.2 3,7 5.2

Given:

Consider the below figure attached with this question.

To find:

The measure of angle r by using the cosine rule.

Solution:

According to Law of Cosine,

Using the Law of Cosine, we get

On further simplification, we get

Therefore, the measure of angle r is 106.78 degrees.

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