Sine formula

The sine formula, sine law, law of sines or sine rule is a formula relating the lengths of the sides of an arbitrary triangle to the sines of its interior angles. According to the formula,


 * $$ \frac{a}{\sin A} = \frac{b}{\sin B} = \frac{c}{\sin C} = 2r$$

where $$a$$, $$b$$, and $$c$$ are the lengths of the sides of a triangle, and $$A$$, $$B$$, and $$C$$ are the opposite angles, and $$r$$ is the radius of the circumcircle of the triangle.