Axis of symmetry of figure is a line about which figure is axially symmetric to themselves. That line divides the figure into two identical parts. Examples of figures with one axis of symmetry: isosceles triangle, isosceles trapezoid, kite. Examples of figures with two axes of symmetry: line segment, rectangle, rhombus. Example of figure with three axes of symmetry: equilateral triangle. Example of figure with four axes of symmetry: square. Examples of figures with infinite axes of symmetry: area of a circle, circle. Examples of figures without axes of symmetry: non-equilateral triangle, this parallelogram.