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OpenStudy (anonymous):
So I am using the Law of Cosines to find sides and angles of a triangle. My sides are a=3 and b=5. My angle is B=80 degrees. How do I go from 5^2=3^2+c^2-2(3)( c)cos80 to c= ?
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OpenStudy (anonymous):
Continue with your equation. Then, you have to solve a quadratic equation for c. You may get 2 values of c. Select the one that fits.
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