The Elongated Pentagonal Bipyramid

The elongated pentagonal bipyramid is the 16th Johnson solid (J16). It has 12 vertices and 15 faces (10 equilateral triangles and 5 squares).

The elongated pentagonal

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


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

Projection Envelope Description
Regular pentagon

Top view.


Front view.


Side view.


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

where φ=(1+√5)/2 is the Golden Ratio.

Last updated 09 Apr 2018.

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