Math Homework. Do It Faster, Learn It Better.
Line Symmetry
A figure has symmetry if there is a transformation of the figure such that the image coincides with the preimage.
The line of symmetry (line symmetry or reflection symmetry) of a figure is a line that divides the figure into two congruent parts which are mirror image of each other.
Example:
A square has lines of symmetry, a parallelogram has no lines of symmetry, and a rectangle has lines of symmetry.
