Copy the given figure on a squared paper. A square paper is what you would have used in your arithmetic notebook in earlier classes. Then complete them such that the dotted line is the line of symmetry.
Drawing the line of symmetry:
First draw the given figure on squared paper.
The dotted line shown below is the line of symmetry which means the dotted line will act as a plane mirror for the given figure.
The same image will be drawn to the left of the given figure.