In geometry, a bipyramid, dipyramid, or double pyramid is a polyhedron formed by fusing two pyramids together base-to-base.

A triangular bipyramid is a hexahedron with six triangular faces constructed by attaching two tetrahedra face-to-face. The same shape is also known as a triangular dipyramid [1] [2] or trigonal bipyramid. [3] If these tetrahedra are regular, all faces of a triangular bipyramid are equilateral.

A hexagonal bipyramid is a polyhedron formed from two hexagonal pyramids joined at their bases. The resulting solid has 12 triangular faces, 8 vertices and 18 edges. The 12 faces are identical isosceles triangles.

The meaning of BIPYRAMID is a crystal consisting of two identical pyramids base to base.

Illustrated definition of Bipyramid: A double-pyramid, made by joining a pyramid and its mirror image base-to-base. Here is a hexagonal bipyramid....

A bipyramid can be projected on a sphere or globe as n equally spaced lines of longitude going from pole to pole, and bisected by a line around the equator. Bipyramid faces , projected as spherical triangles , represent the fundamental domains in the dihedral symmetry D nh .

In mathematics, a bipyramid is defined as a polyhedron that has two n-sided polygonal bases and n triangular faces that connect the two bases. The most common form of a bipyramid is a triangular bipyramid, which has two triangular bases and three triangular faces.

2025年1月14日 · A bipyramid is a geometric shape that consists of two congruent polygonal bases connected by an equal number of triangular faces. Think of it as a pyramid with two bases instead of one, like a fancy geometric sandwich.

In general, a bipyramid can be seen as an n-polytope constructed with a (n-1)-polytope in a hyperplane with two points in opposite directions, equal distance perpendicular from the hyperplane. If the (n-1)-polytope is a regular polytope, it will have identical pyramids facets.

In geometry, the gyroelongated bipyramids are an infinite set of polyhedra, constructed by elongating an n-gonal bipyramid by inserting an n-gonal antiprism between its congruent halves.