HomeEtudes The section contains both entertaining pop-science stories about modern mathematical problems, and animations that reveal well-known subjects in a new way. More etudes — in the Russian version
Mathematics and Technology4 Train wheels Corner reflector How deep is the underground station Steering geometry
Polyhedra’s outer geometry6 Shadows Regular polyhedra harmony Volume increasing Amazing volumes of polyhedra Piecewise linear embedding of a polyhedron Flexible polyhedra
Areas and volumes6 Plane areas Pick’s formulaPythagorean Theorem: Euclid's proof Pythagorean theorem: Interactive puzzle Sphere volume: Archimedes Scales Ball volume
Formula geometry3 Stairway to infinity Geometric progression: the chess legend Geometric progression decrease
Hinge mechanisms6 Hinge mechanisms Parallelogram Lipkin linkage Translation and rotation Angle trisection Degrees of freedom
