Law of Cosines

The Law of Cosines describes fundamental properties of triangles. Use this Formula Solver! Series program to learn how it works (and to check your homework answers, too!)

Get More Help!

Click one of these links to get more help from another Cramlet in this same chapter:

• Tangent Function in a Right Triangle
• Tangent & ArcTangent in a Right Triangle
• Soh-Cah-Toa and Trigonometry Functions
• Sine Function in a Right Triangle
• Sine & ArcSine in a Right Triangle
• Secant Function in a Right Triangle
• Radians
• Non-Right Triangles Study Sheet
• My Angle Functions Flashcards
• Law of Sines Ambiguous Case
• Law of Sines
• Law of Cosines
• Cotangent Function in a Right Triangle
• Cosine Function in a Right Triangle
• Cosine & ArcCosine in a Right Triangle
• Cosecant Function in a Right Triangle
• Area of a Triangle Using Sine
• Angle Functions Quiz