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High School Geometry
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Demonstrations 21  40 of 309
Folding an Octahedron from Squares
Fractal Tetrahedron
Polyhedron Dual
Archimedean Solids
Platonic Solids
An IMO Triangle Problem
Spirals of Squares
Spinning Out Sine and Cosine
Intersecting Circles
Doubling a Distance with a Compass
Enlargement in Two Dimensions
Bézier Curve Approximation of an Arc
How Many Gallons in My Pool?
Equal Cores and Shells in Circles and Spheres
Haberdasher's Problem
Four Concyclic Points
Cross's Theorem
Albrecht Dürer's Heptagon of 1525
How to Avoid a Collision
Lemniscate Linkage
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