8.2-Law of the Cosines Law of the Cosines & Requirements

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The Law of Cosines February 25, 2010.

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Presentation transcript:

8.2-Law of the Cosines 1 2 3 Law of the Cosines & Requirements Area of Triangles 3 Practice Problems

Law of the Cosines

Law of the Cosines Requirements Two sides and an angle between them SAS Three sides SSS If these conditions are not met, the problem cannot be solved with the Law of the Cosines

SAS Example

SAS Example (Cont.)

SSS Example

SSS Example (Cont.)

Area of a Triangle

Area of a Triangle Example

Heron’s Formula

Heron’s Formula Example

Practice Problems Page 587 Problems 5-14, 16-18, 22