law of sines
Also known as sine law, sine rule, sine formula
property of all triangles on a Euclidean plane
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The law of sines is a mathematical property that relates the sides and angles of any triangle, stating that the ratio of each side to the sine of its opposite angle is constant. This relationship is useful because it allows you to find unknown sides or angles of a triangle when you know some of the other measurements.
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In trigonometry, the law of sines (sometimes called the sine formula or sine rule) is a mathematical equation relating the lengths of the sides of any triangle to the sines of its angles. According to the law,
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