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 shape. 3D shapes have ...

Prisms are 3D objects with a constant cross section. Pyramids are 3D objects with a flat base and which taper to a vertex. Many three-dimensional objects can be constructed from 2D nets.

Even when the visual features, such as colour and luminance were controlled for, they said the mice could still generalise from 2D picture to 3D object. “Results from a series of experiments ...