The complex number $w$ is defined by $w = - 1 + i$.
a) Find the modulus and argument of ${w^2}$ and ${w^3}$, showing your working.
b) The points in an Argand diagram representing $w$ and ${w^2}$ are the ends of a diameter of a circle. Find the equation of the circle, giving your answer in the form $\left| {z - \left( {\alpha + bi} \right)} \right| = k$.
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