Answer
$a^{2}$ = $b^{2}$ + $c^{2}$ - 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
Elementary Geometry for College Students (5th Edition)
by Alexander, Daniel C.; Koeberlein, Geralyn M.
Published by
Brooks Cole
ISBN 10:
1439047901
ISBN 13:
978-1-43904-790-3
Chapter 11 - Section 11.4 - Applications with Acute Triangles - Exercises - Page 527: 7b
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