Calculation: K2ma4R - 1

 
 a
/ sin(A)
  = 
 
 b
/ sin(B)
 
 a
/ sin(A)
 =  
 b
/ sin(B)
$$\frac{a}{sin(A)}$$ = $$\frac{b}{sin(B)}$$
a =  
 b* sin(A)
/ sin(B)
$$a$$ = $$\frac{b\cdot sin(A)}{sin(B)}$$