Level 1: Stage 2

BIPYRAMID

What you need

3 octafold segments

(3 pairs of triangle segments).

Basic traits

Equilateral triangle faces: 6

Vertices:  5

Edges: 9

 

!

The triangular bipyramid (or dipyramid) is, as its name implies, two (bi-) pyramids combined. It is known as the Johnson solid number 12, or in short, J12.