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October 2, 2014

October 2, 2014

Posted by **TT** on Friday, March 26, 2010 at 10:00pm.

- Math - Trig -
**MathMate**, Friday, March 26, 2010 at 10:07pmIf y is the third side of a triangle, you could use the cosine rule, where

a,b are lengths of adjacent sides, and C is the included angle between a and b.

then the length of the third side, c, is given by:

c²=a²+b²-2ab cos(C)

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