Sewing narrow strips to two adjoining sides of the center square and wide strips to the remaining two sides create the curve. Mark the wrong side of the center square through the holes on the tool to ensure a perfect seam allowance.
Step 1：Fix wrong seam allowance based on outermost center square
Then sew a round two narrow and two wide strips and trim. Add two more rounds to complete a perfect 8 inch finished block.
Step 2：Fix wrong seam allowance based on center square of second layer
Step 3：Fix wrong seam allowance based on center square of third layer
The cutting requirements for the narrow and wide strips and the center square are printed right on the tool. Sew four blocks together to piece a circle which finishes to 16 inches.
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