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Law of Cosines. Page 267. Law of Cosines. Just like the Law of Sines, the Law of Cosines represents the relationship between the sides and angles of a triangle.
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Law of Cosines Page 267
Law of Cosines • Just like the Law of Sines, the Law of Cosines represents the relationship between the sides and angles of a triangle.
When given the lengths of a and b and the angle between them, , we can find the length of the third side c by using this equation: