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It means that when it is flipped over an axis and the image is essentially a mirror image or reflection of what it was.
It is an exact replica of an shape on agraph only in a different area of the coordinate plane.
The image.
The three types of dilations are an enlarged image (the image is larger than the preimage), a reduced image (the image is smaller than the preimage) and an equal image (the image is the same size as the preimage).
The 3 transformations of math are: translation, reflection and rotation. These are the well known ones. There is a fourth, dilation, in which the pre image is the same shape as the image, but the same size in the world