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 Related Terms
 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.
Angle of Rotation: The number of degrees that a figure is rotated about a fixed point.
Axis of Rotation: A line about which a figure in space rotates (or spins).
Rotation: A transformation that turns a figure about a fixed point at a given angle and a given direction.
Symmetry: The property of a figure or expression that allows for parts of it to be interchanged without forcing a change in the whole