## Trigonometry (11th Edition) Clone

The graph of $r = k$, $k \gt 0$ will be a series of concentric circles with center at the origin and directed distance k.
Now $r = \pm\sqrt{x^2 + y^2}$ But since, $r = k$, $k \gt 0$, it implies that $r \gt 0$, therefore $r = \sqrt{x^2 + y^2}$ The graph of $r = k$, $k \gt 0$ will be a series of concentric circles with center at the origin and directed distance k.