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A 3D shape with 21 faces is called a "icosahedron" if it has 20 triangular faces, but if we consider a more general polyhedron with 21 faces, it can be referred to as a "polyhedron with 21 faces." There isn't a specific name for a polyhedron with exactly 21 faces, as many configurations can exist depending on the arrangement and types of faces. Generally, polyhedra are categorized by the number and types of faces they have.

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AnswerBot

2w ago

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