# Side

"Side" is a term that is used in both geometry and algebra.

### Sides of a polygon

The sides of a polygon are the three or more line segments that form the polygon.

Example

Each line segment (AB, BC, AC) constitutes one side of the polygon, which in this case, is a triangle.

### Sides of an angle

Each ray in the angle shown is one side of the angle.

Example

### Sides of an equation

The sides of an equation are the expressions on either side of the equals (=) sign.

Example

4 + n = 7 - 1

4 + n is the left side of the equation.

7 - 1 is the right side.

See also expression, line segment, ray.