Explore the properties of 2D shapes from one-sided circles to the eight-sided octagons. Shapes with 3 sides Explore shapes with 3 sides and look at curved and straight lines. Shapes with 4 sides ...

2D shapes can ... or both! 3D shapes are described by their faces, edges and vertices. The faces can be the same shape or different, and a 3D shape could have a curved surface as well as flat ...