Will the values described in each situation be rational or irrational?

Select Rational or Irrational to describe each situation.I put "R" and "I" to represent the choices I choose.

the length of a rectangle with a rational area and irrational width

:R the area of a circle with a rational radius :R the perimeter of a square with irrational side lengths

:I the volume of a cube with rational side lengths :R