This e-content is Flash Cards on the topic " Symmetry " . In this content lines of symmetry of triangle , isosceles triangle , scalene triangle , rectangle , square , rhombus , quadrilateral , regular hexagon and circle are explained. If you can reflect (or flip) a figure over a line and the figure appears unchanged, then the figure has reflection symmetry or line symmetry. The line that you reflect over is called the line of symmetry. A line of symmetry divides a figure into two mirror-image halves.