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 ...
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Archaeology breakthrough as scientists discover mysterious 'voids' in third-largest pyramid of Giza
Scientists have been left baffled after two mysterious air-filled spaces were discovered behind one of Egypt's great pyramids ...
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