Respuesta :

sqdancefan
Comparing the given equation to the standard form for the equation of a circle,
   (x -h)² + (y -k)² = r²
we find that
   h = 0
   k = -9
   r = 5

The circle is centered at (h, k) = (0, -9). It has radius 5.
Ver imagen sqdancefan