Use a graph paper for this question (Take $2\mathrm{cms}=1$ unit on both $\mathit{x}$ and $\mathit{y}$ axis)
(i) Plot the following points: $\mathrm{A}\left(0,4\right),\mathrm{B}\left(2,3\right),\mathrm{C}\left(1,1\right)$ and $\mathrm{D}\left(2,0\right)$.
(ii) Reflect points $\mathrm{B},\mathrm{C},\mathrm{D}$ on the $\mathit{y}$-axis and write down their coordinates. Name the images as ${\mathrm{B}}^{\prime },{\mathrm{C}}^{\prime },{\mathrm{D}}^{\prime }$ respectively.
(iii) Join the points A, B, C, D, D', C', B' and A in order, so as to form a closed figure. Write down the equation of the line of symmetry of the figure formed.