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 ...

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 ...

Gauging the properties of 2D and 3D shapes in space sets children up for finding their way around their world, says Julie Mountain and Felicity Robinson Creative mathematical skills are used in den ...