“Touching” mathematical facts is fascinating and rewarding. An electronic encyclopaedia of models will collect all the known ideas. It is possible to build many of the presented models yourself.
More models — in the Russian version
Pythagorean theorem6
Triangle, polygons9
Areas and dissections of shapes8
Circle4
Conic sections: parabola9
Conic sections: hyperbola7
Conic sections: ellipse7
Constant width curves3
Wonderful curves3
Polyhedra15
Wonderful bodies8
Volumes3
Arithmetic and geometric progressions1
Trigonometry3
Integral, derivative1
Combinatorics, probability, randomness2
Packing and coverings3
Geometric transformations2
Kaleidoscopes6
Non-Euclidean geometry3
Mechanics7
9
Optical illusions2
