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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.

Architects have used the elements of polyhedra in designing their constructions since ancient...

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