Let $R_1$ and $R_2$ be two relation defined as follows :
$\mathrm{R}_1=\left\{(\mathrm{a}, \mathrm{b}) \in \mathrm{R}^2: \mathrm{a}^2+\mathrm{b}^2 \in \mathrm{Q}\right\}$ and
$R_2=\left\{(a, b) \in R^2: a^2+b^2 \in Q\right\}$,
where $Q$ is the set of all rational numbers. Then :
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