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 Related Terms
Symmetry:  The property of a figure or expression that allows for parts of it to be interchanged without forcing a change in the whole
 Reflectional Symmetry: A figure has reflectional symmetry if, after reflecting the figure over a line, the figure lines back up with itself. Rotational Symmetry: A figure has rotational symmetry if, after rotating it by an angle of 180 degrees or less about its center, the figure lines back up with itself. Transformation: The mapping, or movement, of all the points of a figure in a plane according to a common operation. Asymmetrical: Describes any figure that cannot be divided into two parts that are mirror images of each other. In other words, asymmetrical means "not symmetrical." Axis of Symmetry: A line that a figure can be folded over so that one-half of the figure matches the other half perfectly; a line about which a figure is symmetrical. Line of Symmetry: A line that divides a figure into two parts, each of which is a mirror image of the other. Line Symmetry: Figures that match exactly when folded in half have line symmetry.