A regular polygon with 22 sides has 22 lines of symmetry. This is because a regular polygon is symmetric around its center, and each vertex can be paired up with the vertex directly opposite it.
To understand this better, consider the definition of a line of symmetry: it is a line that divides a shape into two identical halves that are mirror images of each other. In regular polygons, each line of symmetry either passes through a vertex and the midpoint of the opposite side or it goes through the midpoints of two opposite sides. With 22 equal sides and angles, you can draw a line of symmetry for each vertex as well as for the midpoints, leading to a total of 22 symmetrical divisions.