Law of Cosines

Written by Jerry Ratzlaff on . Posted in Trigonometry

trig functionAn equation relating to cosine of an interior angle and the lengths of the sides of a triangle.

Law of Cosines Formula

\(\large{ c^2= a^2+b^2-2ab* cosC }\)

\(\large{ a^2= b^2+c^2-2ab* cosA }\)

\(\large{ b^2= a^2+c^2-2ab* cosB }\)