Sides of an angle
"Side" is a term that is used in both geometry and algebra.
sides of a polygon
The sides of a polygon are three or more line segments that form the polygon.
Each line segment in the figure shown, AC, AB, and CB is one side:
sides of an angle
The sides of an angle are the rays that form the angle.
Each ray in the figure shown, rays BA and BC, is one side of the angle.
sides of an equation
4 + n = 7 - 1
4 + n is the left side of the equation
7 - 1 is the right side