The Elongated Triangular Bipyramid

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The elongated triangular bipyramid is the 14th Johnson solid (J14). It has 8 vertices, 15 edges, 9 faces (6 equilateral triangles and 3 squares).

The elongated triangular bipyramid can be constructed by attaching two tetrahedra to a triangular prism. Its name describes its relation to the triangular bipyramid: inserting a triangular prism between the two constituent tetrahedra to make the bipyramid longer.

Projections

Here are some views of the elongated triangular bipyramid from various angles:

Projection	Envelope	Description
	Equilateral triangle	Top view.
	Hexagon	Side view.
	Hexagon	Front view.

Coordinates

The Cartesian coordinates of the elongated triangular bipyramid with edge length 2 are:

• (0, 0, ±(1+√(8/3)))
• (±1, −1/√3, ±1)
• (0, 2/√3, ±1)