Nine-Point Center, Nine-Point Circle, Euler Line. Interactive illustration.
Mascheroni Construction with compass alone. Midpoint of a segment.
Euclid's Elements Book I, 23 Definitions. One-page visual illustration. Euclid's Elements Book. Index
Sacred Geometry
Equal Incircles Theorem: Triangles, cevians, circles.
Stewart Theorem Triangle and a cevian.
The School of Athens Perspective: the Central Vanishing Point. Video
Interactive Hinged tessellation. Square tessellation - Dynamic Geometry. Please be patient while the applet loads on your computer. This Java applet requires Java 1.3 or higher.
Inca Stone of Twelve Angles, Cuzco. Tunnel effect
Casey's Theorem. Generalized Ptolemy's Theorem.
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