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law of sines

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noun Trigonometry.
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.
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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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

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