5. Sew the Wedges
Beginning at the wide end of the wedge shape, sew the layers together using a ¼” seam allowance. Sew a gradual curve along the angle at the base of the wedge (rather than sewing a distinct point). Stop the seam when you reach the point.
Iron the seam, pressing the seam allowance to one side.
7. Sew the Remaining Wedges
Place the piece you’ve just sewn right-side up on your work surface, and align the next color wedge right-side down, then place a piece of muslin on top of it. (Be sure to take a moment and double-check that you’re assembling the pieces in the correct color order; I found it was easy to get mixed-up and accidentally sew the pieces in the wrong order!)
Continue to assemble the wedges in this order until you’ve assembled six wedges for a half-circle. Then, assemble the other half circle separately. When both half circles are assembled, place them together along the straight edge, and sew them together. (Assembling them in this way ensures that you won’t have a hole in the middle where all the points meet.)