A heptahedron is a closed 3-d shape with 7 polygonal faces. There are 34 topologically different convex heptahedra and, since none of these are regular, the term is ambiguous. Even some simple 3-dimensional objects have a number of different nets so that the number of nets for heptahedra will be very large.
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A heptahedron is one possible answer.A heptahedron is one possible answer.A heptahedron is one possible answer.A heptahedron is one possible answer.
A heptahedron has seven faces, like a heptagon has seven sides.
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A pentagonal heptahedron. A heptahedron is a solid figure with seven faces, and a pentagon is a five-sided plane figure.