How would i make this code draw into a circle?

Can someone tell me how i would make this draw a circle?

        @Override
        public void paint(Graphics g) {
            super.paint(g);
            for(int i = 0; i < 10; i ++) {
                g.drawRect((int) Math.pow(i, 2), 10 * i, 32, 32);
            }
        }