Properties of 2D shapes 2D shapes have sides and corners. Another name for a corner is a vertex. A vertex is a point where two or more lines meet. The plural of vertex is vertices.

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 ...

She has moved on to pick out 2D shapes, including circle, triangle and square — and also knows heart, diamond, and, her favourite, pentagon. She can even correctly identify weather symbols for ...

Color naming in the world's languages has traditionally been viewed as reflecting either a universal set of focal colors, or linguistic relativity. Recently, a different view has gained support: color ...