Given AB of length 7.3 cm and CD of length 3.4 cm, construct a line segment XY

Given \overline { AB } of length 7.3 cm and \overline { CD } of length 3.4 cm, construct a line segment \overline { XY } such that the length of \overline { XY } is equal to the difference between the lengths of \overline { AB } and \overline { CD }. Verify by measurement