The equation of a circle in the coordinate plane can be expressed using the formula:
\[ (x - h)^2 + (y - k)^2 = r^2 \]
where \((h, k)\) is the center of the circle and \(r\) is the radius.
From the information given:
- The center of the circle is \((0, 3)\), so \(h = 0\) and \(k = 3\).
- The radius is \(3\), so \(r = 3\).
Now, substituting these values into the equation:
- \(h = 0\)
- \(k = 3\)
- \(r^2 = 3^2 = 9\)
Putting it all together in the equation:
\[ (x - 0)^2 + (y - 3)^2 = 9 \]
So, filling in the missing information:
\[ (x - 0)^2 + (y - 3)^2 = 9 \]
Thus, the finalized equation is:
\[ (x - 0)^2 + (y - 3)^2 = 9 \]