Side

In geometry, a side is a straight line that is part of a shape. A shape made of straight lines is called a polygon. The number of sides on a polygon can be written as ${\displaystyle n}$.

A side can also mean the face of a 3D shape. A 3D shape made of flat faces is called a polyhedron. The number of faces on a polyhedron can be written as ${\displaystyle F}$.^[1][2][3]

As an example, the square on the right has four sides. The sides in this picture are made with black straight lines. The four sides are:

1. the black straight line from A to B
2. the black straight line from B to C
3. the black straight line from C to D
4. the black straight line from D to A

1. ↑ "List of Geometry and Trigonometry Symbols". Math Vault. 2020-04-17. Retrieved 2020-09-25.
2. ↑ Weisstein, Eric W. "Side". mathworld.wolfram.com. Retrieved 2020-09-25.
3. ↑ "Definition of Side". www.mathsisfun.com. Retrieved 2020-09-25.