Use graph paper for this questrion.

(Take $2\mathrm{cm}=1\mathrm{unit}$ along both x-axis and y-axis )

Plot the point $\mathrm{O}(0,0), \mathrm{A}(-4,4), \mathrm{B}(-3,0)$ and $\mathrm{C}(0,-3)$

State the line of symmetry of this figure. 

Use graph paper for this question. 

(Take $2 \mathrm{cm}=1\mathrm{unit}$ on both x and y axis )

Plot the following points:

$\mathrm{A}(0,4), \mathrm{B}(2,3), \mathrm{C}(1,1)$ and $\mathrm{D}(2,0)$.

Use graph paper for this question. 

(Take $2 \mathrm{cm}=1\mathrm{unit}$ on both x and y axis )

Reflect points $\mathrm{B}, \mathrm{C}, \mathrm{D}$ on the y-axis and write down their co-ordinates. Name the image as $\mathrm{B}\text{'}, \mathrm{C}\text{'}, \mathrm{D}\text{'}$respectively.

Use graph paper for this question. 

(Take $2 \mathrm{cm}=1\mathrm{unit}$ on both x and y axis )

Join the points $\mathrm{A}, \mathrm{B}, \mathrm{C}, \mathrm{D}, \mathrm{D}\text{'}, \mathrm{C}\text{'}, \mathrm{B}\text{'}$ and $\mathrm{A}$ in order, so as to form a closed figure. Write down the equation of the line about which if this closed figure obtained is folded, the two part of the figure exactly coincide.