De Gua's Theorem
Proposed Problem 52: Triangle, angles, incircle.
Machu Picchu is now among seven wonders world July 7, 2007 (07.07.07) .
Einstein and Pythagoras theorem proof
Index, Platonic Solids, Interactive animation, Tetrahedron in the cube, Archimedes and the Rhombicuboctahedron with animation, In the News, Video: How to make platonic solids with gum drops and tooth picks
Nazca Lines in the news
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