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 ...
3D shapes can be made from 2D shapes called nets. Watch the video to learn how 3D shapes, such as a cube, can be created from nets, an arrangement of 2D shapes. Let's talk about nets. More ...
A strange shape described by mathematician Lord Kelvin in 1871 and predicted to behave unusually in a fluid has finally been fully studied in the real world thanks to 3D printing – and it seems Kelvin ...
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