This media is in the public domain (free of copyright restrictions). You can copy, modify, and distribute this work without contacting the Smithsonian. For more information, visit the Smithsonian's ...
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 ...
Students at New Vision Charter School have completed work on a 12-foot-tall Sierpinski Tetrahedron, encompassing 4,096 individual triangular pyramids and made entirely out of card stock and glue, and ...
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