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6.2 Law of Cosines

6.2 Law of Cosines. x 2 = y 2 + z 2 –2yzcosX. Use law of cosines for SSS or SAS triangles . Ex. 1 Find the three angles of a triangle whose sides have lengths a = 8 ft., b = 19 ft., and c = 14 ft. B. c = 14. a = 8. C. A. b = 19. Heron’s Area Formula.

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6.2 Law of Cosines

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  1. 6.2 Law of Cosines x2 = y2 + z2 –2yzcosX Use law of cosines for SSS or SAS triangles.

  2. Ex. 1 Find the three angles of a triangle whose sides have lengths a = 8 ft., b = 19 ft., and c = 14 ft.. B c = 14 a = 8 C A b = 19

  3. Heron’s Area Formula Given any triangle with sides a, b, and c, the area of the triangle is where s = (a + b + c)/2

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