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September 21, 2014

September 21, 2014

Posted by **bob** on Thursday, December 8, 2011 at 10:27pm.

- pre calc -
**Steve**, Friday, December 9, 2011 at 10:58amDraw a diagram. The sides of the triangle are 12,9,5

The angle at C subtends the longest side, so it will be the largest angle.

by the law of cosines,

12^2 = 9^2 + 5^2 - 2*9*5 cosC

144 = 81 + 25 - 90 cosC

cosC = -38/90

C = 115°

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