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March 15, 2020, for children from 6 to 13 years old will be the fourth festival, "Mathematicum" - matematikum2020.ru. This is a family festival that helps parents understand the variety of educational services for children.

The festival will bring together more than 30 mathematical projects. Participants are waiting for more than 70 workshops, open interactive areas, and a quest for the festival.

The event's main goal is to introduce children and their parents to new directions in mathematics, unusual ways of studying it, to show children the importance of mathematics in modern life.

Venue - Russian State Children's Library. Moscow, Kaluga Square house 1. Duration from 11:00 to 17:00.

Details - matematikum2020.ru

1. The radius of the sphere circumscribing the polyhedron;

2. The radius of the sphere inscribed in the polyhedron;

3. The surface area of the polyhedron;

4. The volume of the polyhedron.