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July 28, 2015

Homework Help: Math

Posted by Amy on Sunday, July 24, 2011 at 10:16pm.

Hi I'm reviewing the following solution in my trigonometry text book and I can't figure out how they got their answer. If someone can help explain how they calculated 542.25 for a^2 (nothing I do comes up with that number):

a2=b2+c2-2bcCosA
a2=(16)^2+(11)^2 -2(16)(11)Cos118
a2=542.25
|a2=|542.25
a=23.3


Thank you!

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