3D shapes have faces (sides), edges and vertices (corners). Faces - A face is a flat or curved surface on a 3D shape. For example a cube has six faces, a cylinder has three and a sphere has just one.

2D shapes and 3D objects. Part of Maths. 2D shapes and 3D objects. Properties of 2D shapes. 2D shapes are flat, plane shapes. Triangles have three sides and three angles that add up to 180°.

At last, a use for that industrial knitting machine you bought at a yard sale! Carnegie Mellon researchers have created a method that generates knitting patterns for arbitrary 3D shapes, opening ...