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Plane Geometry
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Demonstrations 81  100 of 1020
Generalizing the Crease Length Problem
Simple 2Column Polyominoes on the Hexagonal Lattice
Three Hinged Dissections of Squares
The Excentral Triangle and a Related Hexagon
Four Concyclic Points
Cross's Theorem
Exploring the Crease Length Problem
Grid Packing at an Angle
Numerical IsoOptic Curve of the Ellipse
IsoOptic Curve of a Regular Polygon
Albrecht Dürer's Nonagon of 1525
Albrecht Dürer's Heptagon of 1525
IsoOptic Curve of the Ellipse
A Concurrency from Midpoints of Arcs of the Circumcircle
A Concurrency of Lines through Points of Tangency with Excircles
Serlio's Ovals
Plato's Shadow Problem
Arbitrary Curves of Constant Width
A Concurrency from Six Pedal Points
Area of a Circle from Sectors
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