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Euclidean geometry simulator

KSEG is a GNU/Linux program for exploring Euclidean geometry. You create a construction, such as a triangle with a circumcenter, and as you drag verteces of the triangle, the circumcenter moves in real time. Other features include:

  • Fast core which supports large constructions
  • Supports multiple languages
  • Construction of points, segments, rays, lines, circles, and arcs
  • Make measurements
  • Transformations (rotation, translation, scaling, reflection)
  • Construction of adaptively sampled loci for better quality and speed
  • Reverse dragging
  • Infinite undo/redo
  • Ability to easily redefine points to "edit" drawings
  • Editable scripting/macro with support for recursion
  • Pretty formulas for calculations-with libkformula
  • Small files
  • Quick play--one step to play any construction from a directory
  • Calculation based transformations
  • Improved selection-to-given matching in constructions


User README included



version 0.403 (stable)
released on 1 May 2007


Related Projects



Verified by

Verified on




Verified by

Janet Casey

Verified on

12 June 2001

Leaders and contributors

Ilya Baran Maintainer
Jorge Barros de Abreu Contributor

Resources and communication

AudienceResource typeURI
Bug Tracking,Developer,SupportE-mailmailto:ibaran@mit.edu

Software prerequisites

Required to useQt 3.x or later

This entry (in part or in whole) was last reviewed on 29 December 2016.


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