Non-right Triangles: Law of Cosines

What you'll learn

1. Use the Law of Cosines to solve SAS (side-angle-side) triangles
2. Use the Law of Cosines to solve SSS (side-side-side) triangles
3. Recognize when to use Law of Cosines vs. Law of Sines
4. Solve applied problems using the Law of Cosines
5. Use Heron's formula to find the area of a triangle given three sides

Prerequisites

• Non-right Triangles: Law of Sines