Lesson Law of Cosines
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Source code of 'Law of Cosines'
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The Law of Cosines is very useful when it comes to trig problems. It comes in 3 forms, {{{c^2=a^2+b^2-2ab(cos(C))}}}, {{{a^2=b^2+c^2-2bc(cos(A))}}}, and {{{b^2=a^2+c^2-2ac(cos(B))}}}. The lowercase letters are the sides and the uppercase letters are the angles. Each side is opposite its corresponding angle. An example is shown here. *[illustration Law_of_Sines] This law will come in use during trigonometry. To see the lesson on the Law of Sines, click <A HREF=https://www.algebra.com/algebra/homework/Trigonometry-basics/law-of-sines-2.lesson?content_action=show_dev>here</A>
