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In ΔABC, if the length of sides a, b, and c are 3.5 centimeters, 5.5 centimeters, and 6 centimeters respectively, what is m∠C to two decimal places

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eyelessjane
I beleive it could be (13/77)=80.28 degrees but I am not so sure >~<
C=arccos(13/77)=80.28 degrees
Look at attachment. 
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