#### Answer

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

#### Work Step by Step

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

Published by
Cengage

ISBN 10:
978-1-337-61408-5

ISBN 13:
978-1-33761-408-5

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

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

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