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law of sines
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law of sines

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Also known as: sines, law of
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sine

law of sines, Principle of trigonometry stating that the lengths of the sides of any triangle are proportional to the sines of the opposite angles. That is, law of sines (a/sinA=b/sinB=c/sinC)when a, b, and c are the sides and A, B, and C are the opposite angles.

This article was most recently revised and updated by William L. Hosch.