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3D Geometry Puzzles

From cubes to Klein bottles.

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Did you know that a soccer ball is modeled from a three-dimensional geometric figure called an icosahedron? The world of 3D geometry is complex, beautiful, and practical:

These quizzes start with the basics, such as determining how 3D figures are constructed:

How many of the following nets will fold up into the square pyramid shown above?

By the end, you'll come to understand mysterious shapes like Klein Bottle:

Master the problem solving skills of Joy of Problem Solving.

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