2D shapes: Types and properties

In a nutshell

2D shapes are flat shapes that are sometimes called plane shapes. There are many different types of 2D shapes. Regular polygons have equal side lengths and equal angles.

Polygons

Polygons are straight-sided shapes. Regular polygons have sides of equal length, and equal angles. Irregular polygons have at least one side or angle that is different in size. Below are examples of polygons.