To find the center of dilation, we need to identify a point in the original trapezoid TRAP that corresponds to a point in the dilated trapezoid T'R'A'P'.
Let's consider the point R (2, 3) in trapezoid TRAP and the corresponding point R' (2 and one half, one and one half) in trapezoid T'R'A'P'. Since R is the center of dilation, it is the point around which the dilation occurred.
Therefore, the center of dilation is point R.