Size follow up question

Sorry for asking about this again. I understand about the dimensions and that the robot has to only touch the ground within the 13x 13 square.
My question is about the 19inch length and 13 inch width.
Are we classing length as the direction the wheels are facing and the width as at right angles to the direction of the wheels?
Many thanks

The entire robot needs to fit within a 13" x 19" rectangle. The orientation of the robot within the rectangle is completely up to you. Thus your wheels can be parallel, perpendicular, or anything in between, to the length or width of the rectangle.