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The Law of Cosines


	The Law of Cosines relates the three side lengths of a triangle with the cosine of one of its angles. If this angle, call it , is formed by sides and and opposite side , then the law of cosines states that . When , the last term is zero, giving the Pythagorean theorem as a special case.


	Contributed by: Chris Boucher

Law of Cosines (Wolfram MathWorld)

"The Law of Cosines" from The Wolfram Demonstrations Project
http://demonstrations.wolfram.com/TheLawOfCosines/

Contributed by: Chris Boucher

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