The symbol that is used to show the congruence of figures is "≅". Since circle A is congruent to circle B, we can express this fact as follows: Circle A ≅ Circle B. The congruence of any two figures can be seen if they can be placed exactly over each other.

The mathematical symbol "≅" is used to show congruence. Two line segments are congruent if they have the same length. Line segment AB and CD above are congruent since each has a length of 3 cm; AB≅CD. The line segments do not need to be parallel to be congruent.