I found that I can do it using Pixmap:
void drawCircle(int x, int y, int radius)
Draws a circle outline with the center at x,y and a radius using the current color and stroke width.
The problem that their isn't a function that can set stroke width.
Is their any other way to do it?
The easiest way would be to draw one before, with a bigger radius. The stroke width would be the difference between radius2 and radius1.