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Law of Cosines

Law of Cosines. Solve SAS Triangles Solve SSS Triangles Solve Applied Problems. Law of Cosines . Case 3: Two sides and the included angle are known Case 4: Three sides are known For a triangle with sides a, b, and c and opposite angles A, B, and C respectively. Solving a triangle (SAS).

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Law of Cosines

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  1. Law of Cosines Solve SAS Triangles Solve SSS Triangles Solve Applied Problems

  2. Law of Cosines Case 3: Two sides and the included angle are known Case 4: Three sides are known For a triangle with sides a, b, and c and opposite angles A, B, and C respectively

  3. Solving a triangle (SAS) Solve the triangle a=2, b=3 and C= 60°

  4. Solving a triangle (SSS) Solve the triangle a=4, b= 3 and c=6

  5. Area of a triangle The area of a triangle is We can also use

  6. Heron’s Formula The area A of a triangle with sides a, b, and c is where

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