\textbf{140-} For every $m$, the equation $y = 6$, $(m+1)x + (m-2)y = 6$ is the equation of a chord of circle $C$. If point $A(-1,1)$ lies on circle $C$, the circumference of circle $C$ is which?
\[
\text{(1)}\ 2\sqrt{3}\pi \qquad \text{(2)}\ 2\pi \qquad \text{(3)}\ 3\pi \qquad \text{(4)}\ 2\sqrt{7}\pi
\]
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