Transformation
A change in position, shape, or size of a figure
Pre-image
The original figure
Image
The transformed image
Isometry
A transformation in which the pre-image and the image are congruent
Reflection
A transformation which produces a mirror image; a "Flip
Translation
A transformation that moves points the same distance and in the same direction; a "Slide
Rotation
A transformation which moves the original figure around a point of rotation; a "Turn
Dilation
A transformation that results in an image that is the same shape as the original, but is either smaller or larger; a "Resize
Enlargement
A dilation in which the image is larger than the pre-image
Reduction
A dilation in which the image is smaller that the pre-image
Scale Factor
The size change from the pre-image to the image