Question

What is the measure of angle A?

Answer 1

38 degrees

Explanation:

The angle can be found using the Law of Cosines:

a² = b² +c² -2bc·cos(A)

cos(A) = (b² +c² -a²)/(2bc) = (3² +7² -5²)/(2·3·7) = 33/42

A = arccos(33/42) ≈ 38.213°

The measure of angle A is about 38°.