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Plane Geometry
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Demonstrations 101  120 of 1083
Constructing the Radius of a Ball
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
Caustics from Radiants at Finite Distance Generated by Rolling Circles
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
The Sum of the First n Odd Numbers
Concave Random Quadrilaterals from Four Points in a Disk
Three Coalescing Soap Bubbles
The Begonia Point
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