Windmill: 1 Draw a circle with compasses, and draw two vertical diameters with O.2 as the center. At this time, four radii appear. Draw a semicircle with these four radii as the diameter. Note that the four semicircles are located on the left, right and upper sides of the diameter respectively. Cut off the other parts of the circle except the semicircle, and the windmill map will be completed. Taiji Diagram: 1 Draw 1. ...