A 3D shape with all straight edges and flat faces is a polyhedron. Other 3D shapes with least one curved surface are not polyhedra. A 3D shape with regular polygonal faces, meeting at equal angles, is ...
In the 2D case, there can be both triangular and quadrilateral elements in the mesh; In the 3D case, there can be tetrahedral elements, triangular prism elements, and hexahedral elements in the mesh ...
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