I'm confused. Draw a circle.Mark the sixths. Got it. Then draw a vertical curved line along one side. How does one know how much of a bend should be in the curve? In other words, how for in from the original circle? Is there a measurement to use for right to left as there is in top to bottom? That first vertical line creates an oval with the side of the circle. But then, you divide that oval??? In half? No mention is made of that second line bisecting the first oval. I'm missing something here.