![]() One of the most basic and familiar polyhedrons is the cube. Polyhedrons can also be concave or convex. Like polygons, polyhedrons can be regular (based on regular polygons) or irregular (based on irregular polygons). Polyhedrons are also often defined by the number of edges, faces and vertices they have, as well as whether their faces are all the same shape and size. See our page Properties of Polygons for more about working with polygons. Polyhedrons are based on polygons, two dimensional plane shapes with straight lines. Polyhedrons (or polyhedra) are straight-sided solid shapes. This page covers both straight-sided solids called polyhedrons, which are based on polygons, and solids with curves, such as globes, cylinders and cones. All physical items, things you can touch, are three-dimensional. Three-dimensional shapes, by their nature, have an inside and an outside, separated by a surface. A three-dimensional solid shape also has depth. This page examines the properties of three-dimensional or ‘solid’ shapes.Ī two-dimensional shape has length and width. ![]()
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