A New Proof of the Law of Cosines

Geometry, Precalculus, Theorems 1 Minute

Source: https://www.facebook.com/AmerMathMonthly/photos/a.250425975006394.53155.241224542593204/635754956473492/?type=1&theater

Law of Cosines

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Published by John Quintanilla

I'm a Professor of Mathematics and a University Distinguished Teaching Professor at the University of North Texas. For eight years, I was co-director of Teach North Texas, UNT's program for preparing secondary teachers of mathematics and science.

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