Meaning of law of sines

law' of sines'

Pronunciation: [key]
— Trigonom. Trigonom.
  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.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.