Faces - A face is a flat surface on a 3D shape. For example a cube ... Right, what about triangles? Triangles become pyramids. You're now a square based pyramid with 4 triangular faces and a ...
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 ...
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