Casey was able to map line segment \overline{UV} UV start overline, U, V, end overline onto line segment \overline{ST} ST start overline, S, T, end overline using a translation and a rotation. Casey concluded: "I was able to map line segment \overline{UV} UV start overline, U, V, end overline onto line segment \overline{ST} ST start overline, S, T, end overline using a sequence of rigid transformations without a dilation, so the figures are congruent but they are not similar." What error did Casey make in her conclusion?