Not sure if this is the right forum, but here goes...
Sketch the locus of those points w with |w| = 3.
What is the locus...?
i suppose $\displaystyle w$ is a complex number here?
if so, say $\displaystyle w = x + iy$ and sketch $\displaystyle |x + iy| = \sqrt {x^2 + y^2} = 3$
if w isn't a complex number, the same principle will apply. you want the set of all points that are 3 units away from 0 (the origin). which would again yield the above graph.