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Martin Ressaar
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Biking on a Sine Curve
Fractal Hand Turkey
Folding a Paper Airplane
Creating Distances in 3 Space
Dissection Proofs of Pythagoras' Theorem
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Eigenschappenvenster
Problem 3 9-point circle
Olimpiada Ialomița-Suceava.
minmum area
Quora Puzzle triangle ABC AD=BD and DB=BC