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Geometry
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Demonstrations 2361  2380 of 3629
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
The Triangles Formed by the Endpoints and Midpoints of Cevians
Distance of a Point to a Polygon
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