Pronunciation: /ˈpri.ɪm.ɪdʒ/ Explain

A pre-image is a geometric object before a geometric transformation. The image is the geometric object after the transformation.

Click on the blue points and drag them to change the figure.

This shows the pre-image and image for a refection of a triangle about a line.
Manipulative 1 - Pre-Image Created with GeoGebra.


  1. McAdams, David E.. All Math Words Dictionary, preimage. 2nd Classroom edition 20150108-4799968. pg 144. Life is a Story Problem LLC. January 8, 2015. Buy the book

Cite this article as:

McAdams, David E. Preimage. 12/21/2018. All Math Words Encyclopedia. Life is a Story Problem LLC.

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Revision History

12/21/2018: Reviewed and corrected IPA pronunication. (McAdams, David E.)
12/1/2018: Removed broken links, updated license, implemented new markup. (McAdams, David E.)
5/3/2010: Initial version. (McAdams, David E.)

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