Suppose $a \in \mathbb{C}$ and $r>0$. Let $D(a,r)$ be a disk. Show that $Win(\partial D(a,r),z)= 1$ when $|z-a|<r$ and $Win(\partial D(a,r),z)= 0$ when $|z-a|>r$
I am not sure where to even start with this problem. I know it is talking about a point inside the disk and the winding number is 1 and a point outside the disk and the winding number is 0, but I am not sure where to put a piecewise smooth curve $\gamma(t)$.