Given that "Rectangle ABCD is congruent to rectangle URST."
That means rectangle ABCD and rectangle URST look exactly same having equal length and width.
As congruent rectangles are exactly same by definition, then their area will also be equal. Value of area of rectangle ABCD is not given but say if it is 135 sq mm then area for rectangle URST will also be exactly same 135 sq mm.
