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: 28

Answer

See the steps.

Work Step by Step

If the Law of Cosines: $a^2 = b^2+c^2-2bc \cos{A}$ is reduced to: $$a^2 = b^2+c^2$$ $\therefore \cos{A} = 0 \hspace{20pt} A = 90^\circ$
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