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Sullivan Algebra and Trigonometry: Section 8.3 The Law of Cosines

Sullivan Algebra and Trigonometry: Section 8.3 The Law of Cosines. Objectives of this Section Solve SAS Triangles Solve SSS Triangles Solve Applied Problems.

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Sullivan Algebra and Trigonometry: Section 8.3 The Law of Cosines

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  1. Sullivan Algebra and Trigonometry: Section 8.3The Law of Cosines • Objectives of this Section • Solve SAS Triangles • Solve SSS Triangles • Solve Applied Problems

  2. We use the Law of Sines to solve CASE 1 (SAA or ASA) and CASE 2 (SSA) of an oblique triangle. The Law of Cosines is used to solve CASES 3 and 4. CASE 3:Two sides and the included angle are known (SAS). CASE 4: Three sides are known (SSS).

  3. Law of Cosines

  4. 3 a 4

  5. 3 2.57 4

  6. 5 3 7

  7. 5 3 7

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