congruence
when two figures or objects in geometry have the same shape and size, or if one has the same shape and size as the mirror image of the other
en-US/ˈkɑŋɡɹuəns/
en-GB/ˈkɒnɡɹuːəns/
when two figures or objects in geometry have the same shape and size, or if one has the same shape and size as the mirror image of the other