Laws of Cosine

Video title: Law of Cosines

An online trigonometry video that provides students with an introduction to the law of cosines and how it is applied to calculate the length of a side of a triangle when the lengths of 2 sides and an angle are known.
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Khan Academy videos are licensed under a Creative Commons 3.0 License. This video is owned and provided free of cost by Khan Academy. Copyright Khan Academy 2010

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