Elementary Geometry for College Students (7th Edition)

Published by Cengage
ISBN 10: 978-1-337-61408-5
ISBN 13: 978-1-33761-408-5

Chapter 11 - Test - Page 534: 17


$a^{2}$=$b^{2}$+$c^{2}$-2bc cos a

Work Step by Step

We have to consider the other two sides (b and c) and the opposite angle (a).
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