In this lecture, we will learn about symmetry. Symmetry means both sides of a shape or object look the same, like a mirror image. If you can fold, flip, slide, or rotate a shape and both parts match exactly, it has symmetry. The line of symmetry is an imaginary line that divides a shape into two equal halves. This line can be vertical, horizontal, or diagonal. Some shapes have one line of symmetry, like a kite or isosceles trapezium. Others have two lines (rectangle, rhombus), three lines (equilateral triangle), or four lines (square). A regular pentagon has five, and a circle has unlimited lines of symmetry.