#### Answer

$6^{2}$ = $9^{2}$ + $10^{2}$ + 2*9*10*cos α

#### Work Step by Step

given data a= 6,b=9 ,c= 10
using theorem 11.4.3
$a^{2}$ = $b^{2}$ + $c^{2}$ + 2bc cos α
$6^{2}$ = $9^{2}$ + $10^{2}$ + 2*9*10*cos α

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Published by
Cengage

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

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

$6^{2}$ = $9^{2}$ + $10^{2}$ + 2*9*10*cos α

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