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Makovka662 [10]
3 years ago
10

Can someone pls help? ab to fail geometry. any help is nice.

Mathematics
1 answer:
Mamont248 [21]3 years ago
7 0
By the law of cosines, the angle C satisfies

8.77^2=2^2+9^2-2\times2\times9\times\cos C

which reduces to

\cos C=0.2246\implies C=\arccos(0.2246)\approx1.34422\text{ rad}

which converts to approximately 77 degrees (this can be done my multiplying by 180 and dividing by pi).
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