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 Related Terms
 Angle of Rotation:  The number of degrees that a figure is rotated about a fixed point.
Angle: Region between two rays or the amount of rotation about a fixed point.
Degree of an Angle: A unit for measuring angles.
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.
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.