Answer
the circle of radius $2$ has larger curvature than the circle of radius $4$.
Work Step by Step
Since the curvature of a circle of radius $r$ is $\frac{1}{r}$, and $2\lt 4$ then $\frac{1}{2}\gt \frac{1}{4}$; that is, the circle of radius $2$ has a larger curvature than the circle of radius $4$.
