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A sin-1 asinbb. To account any angle A B or C say B access the adverse ancillary b again addition angle-side brace such as A and a or C and c. Triangle Angle Calculator Formula Omni Triangle Angles Calculator Words Angles By using the law of sine calculator you can find all sine law values instantly and 100 error-free. Law of sines calculator . A b 2 c 2 2 b c c o s A. It works for any triangle. Assuming that a b and c are the 3 sides of the triangle opposite to the angles A B and C as shown. A sin A b sin B c sin C. The sine law for the above triangle is written as a sinA b sinB c sinC and is used to solve triangle problems. A sin α b sin β c sin γ This ratio is also equal to the diameter of the triangles circumcircle circle circumscribed on this triangle. The three law of cosines formulas are given as. Therefore the length of side a is approximately 35cm. This calculator uses a special trigonometric rule to demonstrate the Law of Sines as follows. The p