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Plane Geometry
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Demonstrations 61  80 of 1018
Circumcircles of Two Midpoints and an Altitude
Bisecting the Area and Perimeter of a Triangle
Bisecting a Triangle
Three Circles with Two Common Tangents
Reflections of a Line through the Orthocenter in the Sides of an Acute Triangle
Squares on a Line Segment
The Kappa Curve as a Locus
The Trisectrix as the Locus of Points of Intersection
Length of the Projection of a Rotating Polygon
Caustics Generated by Rolling Circles
Paper Size Series A
Hinged Dissection of a Pentagram to a Decagon
Haberdasher's Problem
Theobald's Dissection of a Heptagon to a Triangle
Parametric Curves in 2D
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
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