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High School Geometry
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Demonstrations 1  20 of 309
Cylinder Hemisphere Cone
Updated this week
Interior and Exterior Angles of Regular Polygons
Updated this month
Folding an Octahedron from Squares
Fractal Tetrahedron
Polyhedron Dual
Archimedean Solids
Platonic Solids
Cross Sections of Regular Polyhedra
Stairs from Cube
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
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