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Plane Geometry
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Demonstrations 21  40 of 1047
The Obedient Reflected Ray
Dissection of a Square and an Isosceles Right Triangle into a Square
Another Variant of Kosnita's Theorem
NumberTheoretic Construction of Digital Circles
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
Irreptiles Database
The BanachTarski Paradox
Tetrads
Hinged Dissections: From Three Squares to One
Set Operations on Regions
Irreptiles
NonEuclidean Triangle Continuum
Intersecting Circles
Doubling a Distance with a Compass
Neat Alternating Tilings of the Plane
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