Elementary Geometry for College Students (5th Edition)

Published by Brooks Cole
ISBN 10: 1439047901
ISBN 13: 978-1-43904-790-3

Chapter 11 - Section 11.4 - Applications with Acute Triangles - Exercises: 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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