ZACH: This L-shape has all right angles too ... of the terms 'regular' and 'irregular', and recap the names of familiar polygons such as hexagon and octagon. You could give pupils a selection ...

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 have. A three-dimensional (3D) shape is a solid ...