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.
Using the length of the three sides. The proof is better understood than the old one.
A new type of geometric construction that was discovered by Dan Litchfield and David Goldenheim. Includes general explanation and sketch examples.
A husband and wife from Cornell University have come up with a crafty way to illustrate high-level geometry concepts -- by manipulating yarn into models that help explain the curvature of spaces. The mathemeticians talk with NPR's Jacki Lyden about hyperbolic crocheting. [4:47 streaming audio broadcast]
Several properties of the complete quadrilateral illustrated with Java applets
The Butterfly theorem and its generalizations illustrated by Java applets.
A collection of all 15 propositions from Archimedes' Book of Lemmas with complete proofs, each accompanied by a Java illustration.
High school students solve complex geometric problems by using GLad Sketchpad. Page includes diagrams.
Discussion board for geometry professors and instructors to keep informed of the latest research.
Graphical representations of computer generated forms. (French/English).
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