Congruent Figures are defined as figures that are identical in size and shape. Or simply when one figure is the mirror image of the other, the figures are said to be congruent. The angles, lengths of sides, overall dimensions of congruent figures are identical.
Similar Figures are figures having same shape. Although such figures may differ in their sizes.
All congruent figures are similar, but not all similar figures are congruent.
Therefore, Diego's point regarding congruent and similar figures is correct. Congruent figures are necessarily of same shape and size but similar figures may have different sizes.
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