noun (plural heptahedra /ˌhɛptəˈhiːdrə/ or heptahedrons)
A solid figure with seven plane faces.
- Around the circle - in which the heptahedron lies - another seven-fold star can be constructed.
- Edges vanish, and it becomes a heptahedron, having three rhombic faces and four triangular faces.
- While all of the faces are regular and vertices equivalent, the heptahedron is self-intersecting and is therefore not considered an Archimedean solid.
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