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High School Geometry
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Demonstrations 1  20 of 309
Cross Sections of Regular Polyhedra
Morley's Theorem
The Statue of Regiomontanus
Triangle Centroid
Rotating a Lattice of Points
Difference of Cubes
Cube Net
Total Areas of Alternating Subtriangles in a Regular Polygon with 2n Sides
The Sum of Opposite Angles of a Quadrilateral in a Circle is 180 Degrees
Stairs from Cube
Simple ThreeLetter Cube
Cone, Tent, and Cylinder
Euler's Polyhedral Formula
Cylinder Hemisphere Cone
Interior and Exterior Angles of Regular Polygons
Folding an Octahedron from Squares
Fractal Tetrahedron
Polyhedron Dual
Archimedean Solids
Platonic Solids
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