what is 2d

In mathematics and geometry, 2D stands for two-dimensional, which refers to a flat figure or a shape that has two dimensions - length and width. Two-dimensional shapes do not have any thickness, and they are completely flat. Examples of 2D shapes include circles, triangles, squares, rectangles, and pentagons. In mathematics, a plane is also a two-dimensional space or flat surface that extends indefinitely. A Euclidean plane is a geometric space in which two real numbers are required to determine the position of each point. Two-dimensional shapes can be classified based on the dimensions they have, and they can be regular or irregular. Regular 2D shapes have all their sides equal in length, and the measure of their interior angles is the same. The sides of irregular 2D shapes are not of equal length, and the measure of their interior angles is also not the same.