A pentahedron.
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icosahedron (its a 20 sided trinagular faced polyhedron)
A heptahedron is a polyhedron with 7 faces, and you can make one with 15 edges.
A polyhedron is a solid figure with many plane faces, usually greater than six. A polyhedron that has 7 faces is called a heptahedron.
Nope - A polygon is a flat, 2-dimensional shape. A Polyhedron is a 3-dimensional shape.
A polyhedron with 5 faces could be called a pentahedron, but a more common name would be a quadrilateral pyramid. A square pyramid is a special case of such a shape.