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April 1, 2015

April 1, 2015

Posted by **hodna** on Monday, April 12, 2010 at 12:12am.

of the side opposite C is c, where c2 = a2 + b2 − 2ab cosC. This is the SAS version of the Law of Cosines. Explain the terminology. Derive an equivalent SSS version of the Law of Cosines, which gives the cosine of the angle in terms of the lengths of the three sides. Now use it to find the angles of the triangle whose sides have lengths 4 cm, 5 cm, and 6 cm.

- geometry -
**Damon**, Monday, April 12, 2010 at 6:16am2 a b cos C = a^2 + b^2 - c^2

cos C = [a^2 + b^2 -c^2]/2ab

a = 4

b = 5

c = 6

cos C = [ 16 + 25 - 36]/40

etc

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