IMPORTANT DEFINITIONS ABOUT SYMMETRY

SIMMETRY: It is a quality of some shapes with some of their parts are reflections of the other.

REFLECTION SYMMETRY: It is a shape´s quality which is formed by two halves facing each other with an axis or fold line in between as if both sides were mirror image of each other.

SIMMETRY AXIS: It is a line which divides a shape into two symmetry halves. Every element of the shape is reflected on the other side and at the same distance from the axis. Symmetry points are on a perpendicular line to it.

CENTRAL SYMMETRY: It is the reflection of  an object through a point called the symmetry center. Every symmetric point is on the other side and of the same distance from the center of symmetry. Symmetric parts of points are colinear with the center.