a pre-image is an image before and image is an image after
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isometry
The image is bigger than the pre-image.
The property is Reflection Symmetry, Line Symmetry or Mirror Symmetry
pre image is the answer if is any help now to anyone
The definition of pre-image in math:For a point y in the range of a function ƒ, the set of points x in the domain of ƒ for which ƒ(x) = y. For a subset A of the range of a function ƒ, the set of points x in the domain of ƒ for which ƒ(x) is a member of A. Also known as inverse image.