4a. Truncated cube 8/3 6/8 from truncation of cube 6/4

Data

The distance from the centre of the cube to the centre of the cube square is EP/2.

The distance from the centre of the truncated cube to the centre of the octagon(red)is1.21

These two distances are equal, thus EA=EP×0.41.

[ Alternative calculation of EA: EP is divided in three parts: x+xÖ2 +x = EP, thus x=EP/(2+Ö2) and

EA = EP ×Ö2 / (2+Ö2)= EP× 0.41 ]

Construction

EP are divided in three parts: Two parts near the corners ,

EP /(2+Ö2) and one between them , EP Ö2 /(2+Ö2)

The six octagons (red) are applied on the original squares (red). The eight corners (yellow) are cut

off, resulting in eight triangles (green-blue).

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Line 1: Cube net and solid.

Line 2: truncated cube net and solid.