FREE ONLINE CALCULATOR / TRIGONOMETRY
Law of Sines Calculator
Find an unknown triangle side given one opposite side-angle pair. Fast, private, and built to make every number easier.
Input values
✦ InteractiveHow does this calculator work?
Find an unknown triangle side given one opposite side-angle pair. Edit the inputs and see the computed results. All calculations take place inside your browser, without submitting values to a server.
a/sin(A) = b/sin(B)
Note: Angle A and B must sum to less than 180°.
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