# Does the number 9 have line symmetry?

Course not: on its own it's just an abstract number, but even the digit is unsymmetrical.

### Do polygons have to have one line of symmetry?

The number of lines of symmetry in a polygon corresponds to the number of sides it has. If a polygon has n sides, then its symmetry will be n lines of symmetry and it will have one point of symmetry. A pentagon has five lines of symmetry, nonagon has 9, n-gon has n lines of symmetry, so on and so forth.