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 ...
There are two sorts of lines that are used to make shapes. These are curved lines. These are straight lines. A two-dimensional or 2D shape is made up of lines. Sometimes the lines are curved and ...
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