A Gallery of Interactive On-Line Geometry
At the Geometry Center.
A New Way to Calculate a Triangle's Area
Using the length of the three sides. The proof is better understood than the old one.
Archimedes' Book of Lemmas
A collection of all 15 propositions from Archimedes' Book of Lemmas with complete proofs, each accompanied by a Java illustration.
Area and volume formulas
Provides area and volume formulas of common geometrical figures
Bette Veteto's Homepage
History of Mathematics, very strong on geometry.
Bob's Pages
A collection of interactive geometry applets. Topics include polyhedra, Poncelet's porism, Soddy's hexlet, Mandelbrot set, Steiner porism, Pappus's chain, Repulsion polyhedra and stereo pictures.
Center of Points in 2- or Higher-dimensional Space
It provides important formulations for finding a center of points in 2 or higher dimensional space. It can be used in drawing delauney triagulation and voronoi diagram in two or higher dimensions. It also describes how many points are required in defining a center in n-dimensional space.
Conjectures Produced by the Program Graffiti
Graffiti is a computer program that makes conjectures in mathematics and chemistry. Links to the conjectures and bibliography.
Cuboid and Cube Surface Distances
A java applet with substantial analysis related to distances on a rectangular box.
Encyclopedia of Triangle Centers
By Clark Kimberling. Over 1000 triangle centres in a searchable compilation with diagrams.
Erich's Packing Center
Graphics and links for various packing, tiling and covering problems.
Fundamentals of Geometry
Free online book on geometry in pdf format. Contains material not easily found elsewhere from detailed exposition of elementary absolute geometry based on Hilbert's axioms to more advanced topics.
Geometric Group Theory
Information and resources about geometric group theory and low-dimensional topology. People, groups, meetings, links.
Geometry Activities
By Ephraim Fithian.
Geometry and the Imagination in Minneapolis
Geometry exercises for a two-week summer workshop led by John Conway, Peter Doyle, Jane Gilman and Bill Thurston at the Geometry Center in Minneapolis, June 1991.
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