As an aside, there is a Swedish food packaging company, Tetra Pak, that was built on the idea of
packaging milk in tetrahedral containers:
Practically speaking, there is another criterion that is important: the surface should
unfold flat to a polygon that
tiles the plane, so that they can be cut out easily.
Of course the regular tetrahedron unfolds to an equilateral triangle,
but also to a $2 \times 1$ parallelogram; I wouldn't be surprised if Tetra Pak used the latter.
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As an aside, there is a Swedish food packaging company, Tetra Pak, that was built on the idea of
packaging milk in tetrahedral containers:
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As an aside, there is a Swedish food packaging company, Tetra Pak, that was built on the idea of
packaging milk in tetrahedral containers:
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