#### 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

Published by
Brooks Cole

ISBN 10:

ISBN 13:

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

You can help us out by revising, improving and updating this answer.

Update this answerAfter you claim an answer you’ll have **24 hours** to send in a draft. An editor
will review the submission and either publish your submission or provide feedback.