# Difference between revisions of "Law of Cosines"

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The '''Law of Cosines''' is a formula used in finding lengths and angles of a triangle. For sides a, b, and c with opposite angles A, B, and C respectively: | The '''Law of Cosines''' is a formula used in finding lengths and angles of a triangle. For sides a, b, and c with opposite angles A, B, and C respectively: | ||

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<math>c^2 = a^2 + b^2 - 2ab\cos C</math> | <math>c^2 = a^2 + b^2 - 2ab\cos C</math> | ||

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+ | <math>b^2 = a^2 + c^2 - 2ac\cos B</math> | ||

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+ | <math>a^2 = b^2 + c^2 - 2bc\cos A</math> | ||

==See also== | ==See also== |

## Revision as of 15:23, 29 June 2006

The **Law of Cosines** is a formula used in finding lengths and angles of a triangle. For sides a, b, and c with opposite angles A, B, and C respectively: