HomeModels“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
Areas and dissections of shapes3 Trapezoid area Dudeny dissectionVanishing cell and the Fibonacci numbers
Conic sections5 Conic sections. A cone with waterConic sections: moiré Saddle surface of a hyperbolic paraboloidHyperbolic paraboloid: a cardboard model Chips: hyperbolic paraboloid
Conic sections: parabola4 Plotting a parabola. Geometric definition Cavalieri’s parabolograph Parabolic billiard Parabola: optical property