Art of Problem Solving
AoPS Online
Math texts, online classes, and more
for students in grades 5-12.
Visit AoPS Online ‚
Books for Grades 5-12 Online Courses
Beast Academy
Engaging math books and online learning
for students ages 6-13.
Visit Beast Academy ‚
Books for Ages 6-13 Beast Academy Online
AoPS Academy
Small live classes for advanced math
and language arts learners in grades 2-12.
Visit AoPS Academy ‚
Find a Physical Campus Visit the Virtual Campus

Law of Cosines

The Law of Cosines is a formula used in finding lengths and angles of a triangle. For sides a, b, and c with opposite angles A, B, and C respectively: $c^2 = a^2 + b^2 - 2ab\cos C$

See also

Retrieved from "https://artofproblemsolving.com/wiki/index.php?title=Law_of_Cosines&oldid=4481"