sentence: any non-self-crossing quadrilateral that has an axis of symmetry must be either a kite ( if the axis of symmetry is a diagonal ) or an isosceles trapezoid ( if the axis of symmetry passes through the midpoints of two sides ) ; these include as special cases the rhombus and the rectangle respectively , which have two axes of symmetry each , and the square which is both a kite and an isosceles trapezoid and has four axes of symmetry .