Mathematics - Straight line Question with Solution | TestHub

Triangle is formed by the lines $\mathrm{x}+\mathrm{y}=0,\mathrm{x}-\mathrm{y}=0$ and $\ell \mathrm{x}+\mathrm{my}=1$. If $\ell$ and m vary subject to the condition ${\ell }^2+{\mathrm{m}}^2=1$, then the locus of its circumcentre is