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WebGraphing.com Forum » List all forums » » Forum: Precalculus and Trigonometry Homework Help » » » Thread: Law of cosine/sine » » » » Post: Law of cosine/sine |
| Posted by nemmymath at Sep 1, 2010 10:21:57 PM |
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Law of cosine/sine Find the requested information using the law of cosines and/or the law of sines. Round to three decimal places. A triangle has sides a = 4 and b = 2 and angle C = 50°. Find the length of side c. I tried using Law of cosine: C^2=4^2+2^2-2(cos50)8 Am not sure if I was doing it right. Thanks for your help. |