Answer
$c^2 = a^2 + b^2 - 2ab\cos(C)$.
Explanation
Use the Law of Cosines when two sides and the included angle (SAS) are known, or when all three sides (SSS) are known.
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What is the law of cosines for a triangle with sides $a, b, c$ and included angle $C$?
Study flashcard from the deck ACT Mastery: English, Math, Reading & Science.