## flashcard

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geometric transformation

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a mapping between two sets of points such that each points in the preimage has a unique image and that each point in the image has exactly one preimage

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## terms list

geometric transformation

preimage

each point in the preimage has a unique image

translation

a slide in a horizontal or vertical direction

reflection

a flip across a line, new figure is a mirror image of the original

rotation

a turn around a point called center of rotation

rotational symmetry

if there is a rotation of less than 360 degrees in which the image and preimage coincide under the rotation

dilation

an expanding or contracting of a geometric shape using a scale factor. Shape, location, orientation remain the same

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