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Plane Geometry
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Demonstrations 101  120 of 1120
Center of Mass of a Perforated Square Plate
Concurrent Diagonals in a 30Gon
Minimum Distance Explorer: Circle to Enclosed Polygon
Trisecting an Angle Using the Cycloid of Ceva
Repeatedly Subdividing Triangles through Special Points
Halving a Triangle Perimeter
The BanachTarski Paradox
Tetrads
Hinged Dissections: From Three Squares to One
Set Operations on Regions
NonEuclidean Triangle Continuum
Intersecting Circles
Doubling a Distance with a Compass
Neat Alternating Tilings of the Plane
Triangulating Random and Regular Polygons
Wheel Graphs with Integer Edges
Tangent Circles to Two Parallel Lines and Passing through a Point
Ratios of the Areas of an Internal Hexagon to Its Star to the External Hexagon
Enlargement in Two Dimensions
Triangle Altitude
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