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 Related Terms
 Rotation:  A transformation that turns a figure about a fixed point at a given angle and a given direction.
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).
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.
Translation: A transformation that "slides" each point of a figure the same distance in the same direction.
Reflection: A transformation that "flips" a figure over a mirror or reflection line.
Dilation: A transformation that changes the size of an object, but not the shape.
Isometry: A transformation that keeps the size and shape of geometric figures the same.