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Stepik

Stepik is a platform with free online courses. Now also mobile Courses contain video lectures and practical assignments, which you can learn at any time. Learn the new For free.

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XSection

Learn how to construct cross sections of polyhedrons. Study different techniques, train yourself, and then solve geometric puzzles. Send in your inquiries and stay up-to-date on the latest XSection news at http://www.euclidea.xyz/

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