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law of sines

noun, Trigonometry
1.
a law stating that the ratio of a side of a plane triangle to the sine of the opposite angle is the same for all three sides.
2.
a law stating that the ratio of the sine of an arc of a spherical triangle to the sine of the opposite angle is the same for all three arcs.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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