.If n is even, then the lines of symmetry will pass through two vertices or the
of two opposite sides.

See answer below

Step-by-step explanation:

Lines of symmetry of the polygon.

This is true for regular polygons only.

If the number of sides n is even, there is a line of symmetry which can be drawn from each vertex to the opposite vertex and another line which can be drawn from mid-point of one side to the mid-point of the opposite side