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 ...

At 6ft 5in and 18st 4lb Tommy Walsh, 45, the BBC Ground Force landscaper, is lucky to be alive. When he was 12 he fractured his neck when he fell from the roof of a block of flats in London's East ...