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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 regular pyramid is a pyramid that has a regular polygon at its base and the height of the pyramid passes exactly through its center at the base.

The height of the pyramid 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 surface of the solid and, when bending and gluing, allows you to recreate a geometric solid.

Depending on the number of corners of the base, the correct pyramids distinguish:

- triangular or trihedral pyramids;

- quadrangular or tetrahedral pyramids;

etc.

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