Varignon and Wittenbauer parallelograms. Quadrilateral: midpoints and trisection points of the edges.
Inca Music. One of the best-known Inca folk tune in the world (due to Simon and Garfunkel's interpretation)
Van Aubel's Theorem. Quadrilateral with Squares. Proof with animation.
Butterfly Theorem Proof with animation.
Butterfly Theorem: Puzzle.
Langley's Problem Adventitious angles. 20° isosceles triangle with animation.
Top Ten Reasons to Enjoy Geometry with animation.
Triangle with Squares Problem
Sangaku Problem. The incenters of four triangles in a cyclic quadrilateral form a rectangle.
Cuzco. Inca Empire Capital.
Machu Picchu,The Lost City of the Incas.
The Lord of Sipan.
The Incas
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