URGENT!!
Find the measure of angle C, to the nearest tenth of a degree, on a triangle with side lengths of a=5, b=12, c=13

A. 78.0°
B. 87.3°
C. 90.0°
D. 115.2°

Correct answer is option C.

Step-by-step explanation:

We are given a and  

the side lengths as following:

We have to find the i.e. the angle which is opposite to side c.

Formula for cosine rule:

Where  

a is the side opposite to

b is the side opposite to

c is the side opposite to

Please refer to the attached image for labeling and better understanding of the question.

Hence, it is a right angled triangle with .

Correct answer is option C.

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