Assertion: tetrahedron | /r/HasProperty | embedded into a parallelepiped
Facets:
Source sentences:
text: Every tetrahedron can be embedded into a parallelepiped, each of whose 6 faces is in the plane, passing through a tetrahedron's edge, parallel to the opposite edge (equivalently, take an edge's midpoint, draw a segment, equal and parallel to the opposite edge with the same midpoint, repeat with other edges - the 12 segments are diagonals of 6 parallelograms - faces of the embedding parallelepiped)