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Geometry
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Demonstrations 2241  2260 of 3511
A Visit to Flatland
A Sphere Visits Flatland
Epicycloids from an Envelope of Lines
YinYang Transformations
Spirals in Squares
PancakeCutting Problem
Three Touching Circles on a Line
Tiling a Path with a Single Trapezoid along a Given Curve
Simson's Line
Twins of Arbelos and Circles of a Triangle
Am I in a Polygon?
Transforming a Tetrahedron into a Chestahedron
A Necklace of Equilaterals
Steiner Networks for Four Points
Another Generalization of Pythagoras's Theorem
The Intersection of Two Triangles
Recursive Exercises XI: Homage to Escher
Problems on Circles XIV: Bisecting the Circumference of Three Circles with a Circle
Poncelet's Porism for Quadrilaterals
Area of Triangles Formed by Tangents on the Reciprocal Curve
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