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# 9-4 - 9­4.notebook 9­4 Law of Cosines In triangle ABC 2 2...

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Unformatted text preview: 9­4.notebook November 19, 2010 9­4 Law of Cosines In triangle ABC, 2 2 2 c = a + b ­ 2ab cos C 2 2 2 a = b + c ­ 2bc cos A 2 2 2 b = a + c ­2ac cos B Mar 26­8:15 AM Ex. 1 Suppose that two sides of a triangle have lengths 3cm and 7cm and the angle between them measures 1300. Find length of third side. Mar 26­8:20 AM 1 9­4.notebook November 19, 2010 Ex. 2 The lengths of the sides of a triangle are 5, 10 and 12. Solve the triangle. Mar 26­8:22 AM Ex. 3 In the diagram, AB = 5, BD = 2, DC = 4 and CA = 7. Find AD A B D C Mar 26­8:24 AM 2 9­4.notebook November 19, 2010 H.W. p.352 class exercises 4,5 p. 352 written 1­8 p. 353 9­14, 16 Q.A. # 4 pp. 355­356 1­15 All Mar 27­9:11 AM 3 ...
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