Explore the properties of 2D shapes from one-sided circles to the eight-sided octagons. What is the difference between a 2D shape and a 3D object? Learn the difference between basic 2D and 3D shapes ...

Two-dimensional (2D) shapes are completely flat. They cannot be picked up. A polygon is a 2D shape with straight sides that meet at vertices. Polygons have names that show the number of sides they ...