From now on, crease the entire length of every fold. Valley fold in half, so that the pinch made in Step 11 is in the near layer. Valley fold the folded lower corner to exactly meet the pinch made in Step 11. This means that all 10 central angles of the pentagon will be almost exactly 36 degrees, causing the pentagon to be almost perfectly regular. 0.35016 On a 6 inch square, the error is less than one-quarter of the thickness of the paper.
Valley fold the new flap in half.
Valley fold , so that the main diagonal lines up with the new edge. Valley fold in half. Unfold to Step 18. Unfold one flap from the bottom. On the near flap only, valley fold the short open edge to match the bottom folded edge of the flap.