The circles with wedges are appliqued, not pieced. Sew them off-the-block. Start with a 4"-6" square of fabric for the large circle. Draw the circle on it. Applique each wedge onto the circle. Applique the small center circle. Then cut the unit out as a whole, finger press it, and applique it to the block.
These instructions are also posted on our website, on the Aunt Mille page in the left-hand sidebar.