Ring is a parallelogram. ri=x+6, in=2x+4, and ng=3x. find gr

The opposite sides of a parallelogram are equal.  
In the given parallelogram, ri=ng and in=gr
 ri=x+6 and ng = 3x
 Therefore, 3x=x+6
 Grouping like terms,
  3x-x=6
  2x=6
  x=6/2=3
 
 in=2x+4
 subsituting the value of x,
 in=2*3+4=6+4=10
 
 Since in=gr,
 gr=2x+4 = 10