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gift to 9 usd

Find a gift for the schoolboy that will be interesting, useful, and also not ruin the family budget - is this possible in 2020? We tell you how to please and surprise modern demanding children?
 
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geometric solid - torus

Want to make a fairly complex geometric solid - torus in 10 minutes?
 
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Platonic solids
This group of five geometric solids was given the name of the ancient Greek scientist Plato. Mathematicians call these five polyhedra “regular”, but in ordinary speech we most often call them the Platonic solids.
 
 
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atom1

The creators of the new Atom Browser* decided to choose the image of a polyhedron or an icosahedron for their corporate logo.

 
* - this is a program for viewing websites.
 
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There are five regular polyhedra: a tetrahedron, an octahedron, a cube (also known as a hexahedron), a dodecahedron, and an icosahedron:

Regular polyhedra tetrahedrontetrahedron
Regular polyhedra octahedronoctahedron
Regular polyhedra cubecube
Regular polyhedra - dodecahedrondodecahedron
Regular polyhedra - icosahedronicosahedron
  
 

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