ABCD is a quadilateral. Calculate the value of x.

Since ABCD is a quadrilateral,

We know that sum of the interior angles of any quadrilateral = 360

=>A+B+C+D=360

=>2x+90+x + 3x=360

=>6x+90=360

=>6x=360-90

=>6x=270

=>x = 270/6

=>x = 45