sine rule

• a rule that can be used to find the side of an angle
or the length of a side in a triangle.
• for sides: a/sinA = b/sinB = c/sinC
• for angles: sinA/a = sinB/a = sinC/c
where a, b and c are the sides and
A, B and C are the angles.

EXAMPLES:

sine calculator

http://www.rapidtables.com/calc/math/Sin_Calculator.htm