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What is actually the Cosine rule. can anyone explain it to me in way that I can understand it, explain in a simple way? that provide simple examples? (Only the Cosine rule) thanks in advance, I tried googling online but most of it is full of complexity, our school library is renovated.

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    [Proofs of Law of Cosine](http://en.wikipedia.org/wiki/Law_of_cosines#Proofs)2012-01-17
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    What don't you understand in the [Wikipedia page](http://en.wikipedia.org/wiki/Law_of_cosines) for instance?2012-01-17

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