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Plane Geometry
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Demonstrations 21  40 of 1017
Gardner's Problem
Five Circles Theorem
Bézier Curve Approximation of an Arc
TwistHinged Dissection of a Hexagram to Two Hexagons
Da Vinci's Construction of an Ellipse
PaperFolding an Ellipse
Dissecting a Disk with Six Segments Deleted to a Hexagon
Set of Points Equidistant from Two Points in Taxicab Geometry
PythagoreanHodograph (PH) Cubic Curves
Draw Polygons on Grids
Caustics from Radiants at Finite Distance Generated by Rolling Circles
Neat Alternating Tilings of the Plane
Hinged Dissection of a Generalized Greek Cross to a Square
NoThreeinLine Problem
Marden's Theorem
Halving the Perimeter of a Zigzag Polygon
Halving the Perimeter of a HeartShaped Curve
Trisecting an Angle Using the Cycloid of Ceva
The Sum of the First n Odd Numbers
Concave Random Quadrilaterals from Four Points in a Disk
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