matematicas visuales visual math

A cube intersected by a plane perpendicular to its diagonal can be cut in half. We get a section that is a regular hexagon.

Using eight of these half cubes we can build a truncated octahedron. This relation between the cube and the truncated octahedron can help us to understand that the truncated octahedron is a space-filling polyhedron.

Half cube with hexagonal section | matematicasvisuales

The volume of this half cube is:

Half cube with hexagonal section paper model| matematicasvisuales

REFERENCES

Hugo Steinhaus, Mathematical Snapshots, Dover Publications (3 edition, 1999)
We can read some pages of this book in Google Books: Mathematical Snapshots by Hugo Steinhaus.

LINKS

A truncated octahedron made by eight half cubes
A truncated octahedron made by eight half cubes
Using eight half cubes we can make a truncated octahedron. The cube tesselate the space an so do the truncated octahedron. We can calculate the volume of a truncated octahedron.
The truncated octahedron is a space-filling polyhedron
The truncated octahedron is a space-filling polyhedron
These polyhedra pack together to fill space, forming a 3 dimensional space tessellation or tilling.
The volume of a truncated octahedron
The volume of a truncated octahedron
The truncated octahedron is an Archimedean solid. It has 8 regular hexagonal faces and 6 square faces. Its volume can be calculated knowing the volume of an octahedron.
Volume of an octahedron
Volume of an octahedron
The volume of an octahedron is four times the volume of a tetrahedron. It is easy to calculate and then we can get the volume of a tetrahedron.
The volume of the tetrahedron
The volume of the tetrahedron
The volume of a tetrahedron is one third of the prism that contains it.
Regular dodecahedron
Regular dodecahedron
One eighth of a regular dodecahedon of edge 2 has the same volume as a dodecahedron of edge 1.