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Plane Geometry
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Demonstrations 161  180 of 1139
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
An Application of the GergonneEuler Theorem
Obtuse Random Triangles from Three Parts of the Unit Interval
Obtuse Random Triangles from Three Points in a Rectangle
The Sum of Two CounterRotating Circular Vectors Is an Ellipse
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