Directory: Top/Science/Math/Geometry

The Lepidoptera of the Circles
The Butterfly theorem and its generalizations illustrated by Java applets.
http://www.cut-the-knot.org/ctk/Lepidoptera.shtml
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Archimedes' Book of Lemmas
A collection of all 15 propositions from Archimedes' Book of Lemmas with complete proofs, each accompanied by a Java illustration.
http://www.cut-the-knot.org/Curriculum/Geometry/BookOfLemmas/index.shtml
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Math Forum: Geometry.research
Discussion board for geometry professors and instructors to keep informed of the latest research.
http://mathforum.org/kb/forum.jspa?forumID=130
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Math Forum: Search geometry-forum
Those interested in examining the previous incarnation of the Math Forum may search the archives of the Geometry Forum.
http://mathforum.org/kb/forum.jspa?forumID=126
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Cut the Knot
Features articles about specific problems, illusions, and puzzles. Includes diagrams.
http://www.cut-the-knot.org/geometry.shtml
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Mathematical Curves and Surfaces
Graphical representations of computer generated forms. (French/English).
http://pagesperso-orange.fr/roger.assouly/
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Paul Bourke's Geometry Page
Includes formulas, definitions and three dimensional image illustrations.
http://astronomy.swin.edu.au/~pbourke/geometry/
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Steiner Surfaces
Mathematical descriptions and ray-traced images of various types of Steiner surfaces.
http://www.ipfw.edu/math/Coffman/steinersurface.html
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Sangaku: Reflections on the Phenomenon
Critical reflections on the sangaku phenomenon accompanied by a collection of solved sangaku problems, many with interactive Java illustrations.
http://www.cut-the-knot.org/pythagoras/Sangaku.shtml
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Geometry/Topology at Michigan State University
Activities of the geometry/topology group at Michigan State University.
http://www.math.msu.edu/gt/
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