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Introduction to Topic 11.6 - The Law of Cosines

 

Image of folded triangles

 

 For some problems, we know all three sides of a triangle or two sides and the included angle, and these cannot be solved using the Law of Sines. There is one more law we can use for solving triangles: the Law of Cosines.

Essential question: How can we find a distance between two points given a triangle and some information about that triangle?


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