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$1$. On which axis do the following points lie?$\newline$(i) $P(5,0)$$\newline$(ii) $\mathrm{Q}(0-2)$$\newline$(iii) $R(-4,0)$$\newline$(iv) $S(0,5)$$\newline$$2$. Let $A B C D$ be a square of side $2 a$. Find the coordinates of the vertices of this square when$\newline$(i) A coincides with the origin and $A B$ and $A D$ are along $O X$ and $O Y$ respectively.$\newline$(ii) The centre of the square is at the origin and coordinate axes are parallel to the sides $A B$ and $A D$ respectively,$\newline$BASED ON LOTS