Symmetry in regular polygons

If you cut out a rectangle from a piece of paper and experiment with it and a mirror, you will soon find that it has just two lines of symmetry - one lengthwise and one widthwise.

A rectangle, showing just two lines of symmetry

An equilateral triangle has three lines of symmetry.

Regular polygon's lines of symmetry

Lines of symmetry

Three lines of symmetry on an equilateral triangle.