The Lord of Sipan Puzzle: 22 pieces of polygons.
Kurschak's Tile and Theorem. Jozsef Kurschak (Hungary, 1864-1933) An elegant and a purely geometric way of finding the area of a regular dodecagon.
The Bevan Point The circumcenter of the excentral triangle. Illustration with animation.
The Bevan Point: Puzzle
Cuzco: The Stone of twelve angles An example of Inca skill with polygonal masonry. Puzzle: 22 pieces of polygons.
Machu Picchu. Lost City of the Incas. Puzzle: Puzzle 41 pieces of polyominoes.
Angle between two Simson Lines. Proof with animation.
Simson Line. A proof of Simson line with animation.
Archimedes and the Rhombicuboctahedron. Archimedes the Geometer with animation.
Johnson's Theorem. Three equal circles pass through a common point... Introduction with animation.
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