A polyhedron.
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A polyhedron is closed a 3-dimensional figure whose faces are all polygons. The prefix "octa-" refers to eight and an octahedron is a polyhedron with 8 faces.
They are both 3 dimensional shapes with faces that are polygons.
a sphere
No. A square is a 2-dimensional figure. A cube is a 3-dimensional figure whose faces are all squares.
No. Like all polygons, a heptagon is a 2-dimensional closed figure.