The other triangles are irregular polygons. 3D shapes have different properties to 2D shapes. Faces - A face is a flat surface on a 3D shape. Edges - An edge is where two faces meet. For example a ...

A research group from the Ningbo Institute of Materials Technology and Engineering (NIMTE) of the Chinese Academy of Sciences ...

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.