A heptahedron ( pl. : heptahedra) is a polyhedron having seven sides, or faces. A diminished cube, realized with 4 equilateral-triangle and 3 kite faces, all having the same area, A heptahedron can take a large number of different basic forms, or topologies.
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heptahedron
by chargingvindiction4 August 21, 2024