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Monthly Archives: December 2011

The cos rule without cos

Posted on December 12, 2011 by David Butler

Ever since I first learned it, I’ve always loved the cos rule. It says that if a triangle has two sides a and b, with an angle of C between them, then the remaining side c can be found in this way: c2 = a2 + b2 – 2ab cos C.

The reason I like it […]

Posted in Isn't maths cool? | Tagged maths |

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