### Theory:

In a few cases, there can be two or more lines of symmetry.

Consider the following figure:

The final figure will look like this:

A square has four equal sides. So it is a regular polygon.

A square has $$4$$ lines of symmetry.

In case of regular polygons, the number of lines of symmetry equals the number of sides.

A polygon:
If three or more line segments form a closed surface, then it is a polygon. The line segment can be of any length.
Regular polygon:
If three or more line segments of equal length form a closed surface, then it is called a regular polygon. Equilateral triangle, square, pentagon and hexagon are a few examples of regular polygon.
Let us look at a few more examples.

 Shape Number of sides Lines of symmetry Final figure $$3$$ $$5$$ $$6$$