FREE ONLINE CALCULATOR / TRIGONOMETRY
Law of Cosines Calculator
Calculate the third side of a triangle from two sides and their included angle. Fast, private, and built to make every number easier.
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✦ InteractiveHow does this calculator work?
Calculate the third side of a triangle from two sides and their included angle. Edit the inputs and see the computed results. All calculations take place inside your browser, without submitting values to a server.
c² = a²+b²−2ab cos(C)
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