3b.
Truncated octahedron 6/4 8/6 from
truncation of octahedron 8/3
Data
The distance from the centre of the octahedron to the centre
of the triangle is EP× 0.41
The distance from the centre of the truncated octahedron to the centre of the hexagon
(red) is EA×1.22. . The two distances are equal, thus EA = EP/3.
Construction
The edges are divided in three equal parts.
. The eight hexagons (red) are applied on
the original triangles. The six corners (yellow) are cut off ,
resulting in six squares (green-blue).

Line 1: Octahedron net and solid.
Truncated octahedron net and solid.