Two-dimensional (2D) shapes are completely flat. They have two dimensions – length and width. A polygon is a closed 2D shape with straight sides that meet at vertices. Polygons can be regular or ...

Polygons can be regular or irregular in shape. A polygon is a closed 2D shape with at least three sides. A regular polygon is a polygon with all equal sides and angles. An irregular polygon is a ...

Children should be provided with a large variety of shapes in a range of situations to stimulate learning. Nicole Weinstein suggests some ideas. Shapes are everywhere-regular and irregular, in 2D and ...