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van Aubel's Theorem
Stairs (Optical Illusion)
Construct a Square
Napoleon's Theorem
Cross Product in 2D and 3D
Discover Resources
Square Root Function
hexagon geo
http://archive.ncsa.illinois.edu/Classes/MATH198/whubbard/GR
Quiz: Expressing Angles Using Inverse Trigonometric Function
Exploring Dandelin spheres
Discover Topics
Natural Numbers
Diagrams
Real Numbers
Geometric Transformations
Right Triangles