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 ...

The net of a 3D shape is what it looks like if it is opened out flat. There are many types of nets for the different 3D shapes. A net is made from polygons that can be folded and joined to make a ...

Our team tests, rates, and reviews more than 1,500 products each year to help you make better buying decisions and get more from technology. Pyramids 3D ($13.99) is a multimedia journey into some of ...