The given equation appears to have a typographical error as it does not represent a standard circle equation. The standard form of a circle's equation is ((x-h)^2 + (y-k)^2 = r^2), where ((h, k)) is the center and (r) is the radius. If you can provide the correct equation, I can help you determine the circumference, which is calculated using the formula (C = 2\pi r).