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 ...
A face is a flat surface. An edge is where two faces meet. A vertex is a corner where edges meet. The plural is vertices. A prism is a 3D solid with a uniform cross-section. The two end faces of a ...
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