Droz-Farny circle - MacTutor History of Mathematics
Pierre van Hiele and the history of mathematics
Line -- from Wolfram MathWorld
Geometric Models - Jullien Models for Descriptive Geometry
The Math Book: From Pythagoras to the 57th Dimension, 250 Milestones in the History of Mathematics
8th European Congress of Mathematics
Hyperbolic Spiral - MacTutor History of Mathematics
Geometric Models - Jullien Models for Descriptive Geometry
Taylor Series – Footpath Math: Chalk it up to a math geek
Minimal Path - MacTutor History of Mathematics
Desargues theorem - MacTutor History of Mathematics
How One Line in the Oldest Math Text Hinted at Hidden Universes