Circle quadrature, or entertaining geometry. Perelman Ya.I.

What is the quadrature of the circle, and why did this problem seek not only mathematicians, but also arrogant seekers of fame? It sounds like this: "How to build a square whose area is equal to the area of ​​this circle?" The task does not seem so difficult, but the search for its solution is compared with the compilation of the elixir of eternal life, the search for philosophical stone, as well as the invention of an eternal engine.

Yakov Isidorovich Perelman also offers you to take part in the permission of this ancient puzzle. Learn more about the quadrature of the circle and solve the problems that the great mathematician and the popularizer of science prepared.