Law of sines: which expression represents the approximate length of ?

Law of Sines formulas and equations are used to solve the length of the sides of a triangle. Example a given triangle with sides a, b and c and given angles opposite to the sides are A, B and C. The law stated the following:
a/sinA=b/sinB=c/sinC
We can also solve the missing length of the third side once we are done solving the first and second sides of the triangle, this is called triangulation. 

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