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 ...

The perimeter is the distance around the outside of a 2D shape. The distance can be measured in units like millimetres, centimetres, metres and kilometres. To work out the perimeter, add up the ...

Materials scientists are calling for a collective, global effort to fast-track the mass production of 2D materials like graphene and molybdenum disulfide. Materials scientists at Rice University and ...