When you dilate a figure, the new figure is not congruent to the original figure. Dilation involves resizing the figure by a scale factor relative to a fixed point (the center of dilation).
If the scale factor is greater than 1, the new figure will be larger than the original; if the scale factor is between 0 and 1, the new figure will be smaller. Although the shapes of the figures remain the same (they have the same angles and are similar), the sizes differ, making them non-congruent.
Congruent figures have identical sizes and shapes, while dilated figures maintain the shape but change in size, thus making them similar but not congruent.
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