I and J are the distance in X and Y that the center point exists relative to the start point. For example, if you have a point at X.5 Y2. where a circle starts and the circle center is at X.75 Y2., your code would look like:
G01 X.5 Y2.
G03 X.5 Y2. I.25 J0
because the center point is .25 from the start point in X, and no distance from the start point in Y. Hope this is understandable.
I'm not giving you the answer for two reasons. First, the teach a man to fish thing, and second, I don't know where your circle exists on your coordinate system. Good Luck!