If you count a curve as a line...draw cross hairs on your circle and draw an inner circle through the cross hairs..this divides the circle into 8 equal sections.

Put Cross hairs on your circle. By doing this, you have divided the circle into 4 parts. 360 degrees is a full circle. 360 divided by 12 = 30. Start at the "top" of your circle and mark 30 degrees. This will occur 3 times in each 1/4 segment of your circle. 3 X 4 … Read more

I believe that is the same as the MECHANICS RULE, a method of approx. The square Root. To find the Square Root, an estimate is made first and used as the divisor, the approx. Square Root is the average of the quotient (your answer by division), and the original estimate.
Ex: Find the Sq.Rt of … Read more