2 years ago

Pls help ASAP I’ll give brainliest

Mathematics

1 answer:

NARA [144]2 years ago

7 0

Answer:

B. 11.42

Step-by-step explanation:

<u>Use the law of cosines:</u>

$c = \sqrt{a^2+b^2-2ab*cosC}$

<u>Substitute the values:</u>

$c = \sqrt{9^2+12^2-2*9*12*cos64}=11.42$

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