One program that demonstrates this well is Feather, an iPad app that allows 2D artists to 'draw' in 3D. Now fully offline, ...

What are 2D shapes? Explore the properties of 2D shapes from one-sided circles to the eight-sided octagons. Properties of 3D shapes Learn about faces, edges and vertices.

A polygon is a 2D shape with straight sides that meet at vertices. Polygons have names that show the number of sides they have. A three-dimensional (3D) shape is a solid shape. 3D shapes have ...