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 - Section 11.4 - Applications with Acute Triangles - Exercises - Page 527: 7b


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

Work Step by Step

Given the values of a,b and c We need to find the value of α By using the theorem 11.4.3 In triangle ABC $a^{2}$ = $b^{2}$ + $c^{2}$ - 2bc cosα
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