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Law of Cosines

Law of Cosines. Chapter 5, Section 6. What is the law of cosines?. Used to provide a relationship between the angles and sides of a triangle Relates to the pythagorean theorem First appeared in 1895 in a book by George Albert Wentworth. Law of Cosines Triangle . Examples – 3 sides.

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Law of Cosines

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  1. Law of Cosines Chapter 5, Section 6

  2. What is the law of cosines? • Used to provide a relationship between the angles and sides of a triangle • Relates to the pythagorean theorem • First appeared in 1895 in a book by George Albert Wentworth

  3. Law of Cosines Triangle

  4. Examples – 3 sides

  5. Examples – 2 sides, 1 angle

  6. Area of a Triangle • These are 3 equivalent representations • Only need to use one to find the area

  7. Examples – find the area

  8. Homework • page 494 #3-18 multiples of 3 • Exit Slip: Explain how you know to use the law of sines or the law of cosines in a problem.

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