Which of the following is not a property of congruent figures?

Congruent figures are defined as shapes that are identical in form and size, meaning that they can be perfectly overlapped when one is placed on top of the other. This congruence implies several properties, including having equal perimeter and equal area, as well as identical shapes, which reflects that all corresponding sides and angles are exactly the same.

The option indicating "similar angles but different lengths" describes a characteristic of similar figures rather than congruent ones. Similar figures maintain the same shape and angles but differ in size, meaning the corresponding sides are proportional rather than equal. Therefore, identifying this option as not a property of congruent figures aligns perfectly with the definition of congruence, which emphasizes not just matching angles but also matching side lengths.