afaik: FILL fills your circle, while FILL_AND_STROKE also draws the border. If you increase the size of the stroke, it should result in different circles sizes (only visual!)
Think about this: you draw a circle by hand with a small sized pencil. The radius is what you wanted. If you now take a big brush and draw the circle again, your radius is much bigger... (i hope its understandable O.o )
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