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Linear symmetry is a type of symmetry in which a line can be drawn dividing the figure into two identical parts in such a way that the obtained two parts exactly overlap each other when they are folded along the line. The line is called line of symmetry.
Line of symmetry of a figure can be defined as the line that divides the figure into two equal parts in such away that the two parts are image to each other.
In the given figure, the dotted line divides the figure into two equal parts. So, the given figure has linear symmetry.