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A pyramid is a polyhedron, one of whose faces is a base. The other faces are triangles having a common vertex.

The pyramid height is a perpendicular section drawn through the top of the pyramid to the plane of its base.

The paper net of the pyramid is a flat geometric figure that completely repeats the solid's surface and, when bending and gluing, allows you to recreate a geometric solid.

Depending on the number of corners of the base, the correct pyramids determine whether they are:

- triangular or trihedral pyramids;

- quadrangular or tetrahedral pyramids;

etc.

The founders of Mirny, located in the Arkhangelsk region, placed a polyhedron, the Great...

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A polyhedronis a solid bounded by flat polygons, which are called faces....

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Suppose you first saw the edition “Magic Edges” on the counter of a bookstore or Internet...

In the micro-world, polyhedra are found in molecules, viruses, and bacteria - the simplest...