Answer
law of cosines.
Work Step by Step
By the law of cosines: $c^2=a^2+b^2-2ab\cdot \cos{(C)}$, which means that if we have three sides of the triangle given, we can count all included angles, hence the answer is law of cosines.
Precalculus (10th Edition)
by Sullivan, Michael
Published by
Pearson
ISBN 10:
0-32197-907-9
ISBN 13:
978-0-32197-907-0
Chapter 8 - Applications of Trigonometric Functions - 8.3 The Law of Cosines - 8.3 Assess Your Understanding - Page 537: 3
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