Assertion (A) : The origin and the roots of
the equation ${\mathrm{x}}^2+\mathrm{ax}+\mathrm{b}=0$ form an equilateral
triangle if ${\mathrm{a}}^2=3\mathrm{b}$

Reason (R) : If ${\mathrm{z}}_{1,}{\mathrm{z}}_{2,}{\mathrm{z}}_3$ are vertices of an equilateral
triangle then ${\mathrm{z}}_1^2+{\mathrm{z}}_2^2+{\mathrm{z}}_3^2={\mathrm{z}}_1{\mathrm{z}}_2+{\mathrm{z}}_2{\mathrm{z}}_3+{\mathrm{z}}_3{\mathrm{z}}_1$