Images for Mathematics

From a tetrahedron to an octahedron

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How to transform a tetrahedron into an octahedron: we make some successive sections with 4 planes that round off the vertices and are perpendicular to the rotations axes that go through the 4 couples of vertices (during the construction we get also a uniform polyhedron of type (3,6,6)). The dimensions of the polyhedra in the figure don't reproduce exactly this construction. Instead, the polyhedra in the figure represent the sections of a hypercube with 3-dimensional spaces perpendicular to a diagonal of the hypercube. In the same way, if we section a cube with planes perpendicular to a diagonal, we get triangles and hexagons.

The image belongs to the sections...:
Other costructions (3D geometry)
Uniform polyhedra and their duals (3D geometry)
Sections of a hypercube (4D geometry)

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