Trigonometry 7th Edition

Published by Cengage Learning
ISBN 10: 1111826854
ISBN 13: 978-1-11182-685-7

Chapter 7 - Section 7.2 - The Law of Cosines - 7.2 Problem Set - Page 378: 4



Work Step by Step

Given three sides $a$,$b$ and $c$, and assuming that $c$ is the largest side. We solve for the largest angle $C$ first using the law of cosines as it might be obtuse. $$\cos{C} = \dfrac{a^2+b^2-c^2}{2ab}$$
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