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 ...

What makes a shape 2D? A shape is 2D if it is flat. 2D means it has two dimensions: length and breadth or length and height 2D shapes include circle, triangle, square, rectangle. pentagon, hexagon.