Architectural design made with Tetrahedrons and regular Pyramids based square.

Two-piece pyramid puzzles: A regular pyramid is not possible in this case.

Season 6 removed the Triangle of Immunity, as the Friendship piece is back to a regular pyramid piece.

For a truncated regular pyramid (a regular pyramid with some of its peak removed by a plane parallel to the base), the apothem is the height of a trapezoidal lateral face.

For a regular pyramid, which is a pyramid whose base is a regular polygon, the apothem is the slant height of a lateral face; that is, the shortest distance from apex to base on a given face.

A right regular pyramid is one which has a regular polygon as its base and whose apex is "above" the center of the base, so that the apex, the center of the base and any other vertex form a right triangle.