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Transformations Vocabulary

AB
preimageThe original figure, before it has been transformed.
dilationA non-rigid transformation in which the preimage and image of a figure are similar.
tessellationA tiling of a plane with figures that leave no gaps or overlaps.
imageThe new figure which has been transformed using a motion-rule on each point of the preimage.
mapA movement from the preimage to the image.
transformationThe operation that maps the preimage onto the image.
rigidA transformation in which the preimage maps onto a congruent image.
isometryA rigid transformation that preserves length, angle measures, parallel lines, and distances between points.
reflectionA rigid transformation that flips a figure over a given line.
line of symmetryA figure in a plane has a ______ if the figure can be mapped onto itself by a reflection in the line.
rotationA rigid transformation in which a figure is turned about a fixed point.
rotational symmetryA figure in a plane has _____ if the figure can be mapped onto itself by a rotation of 180 degrees or less.
translationA rigid transformation that slides a figure on a coordinate plane. The movement can be vertical, horizontal, or diagonal.


Mathematics Teacher
Carlisle High School
Carlisle, PA

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