It was not mathematicians who first proposed the correct calculation method of pi, but Liu Xin, a writer in the late Western Han Dynasty. Liu Xin's determination of pi 3. 1547 is obtained from the ratio of points on the circumference to points on the diameter of 6+2√3 to 3. The ratio is (6+2√3)/3 or 3. 1547005383 ... (that is, pi).
There are Archimedes, Liu Hui and Zu Chongzhi. All right, 6x2? The ratio of the perimeter of the polygon to the diagonal line passing through the center point is 3. 14 15926, which should be called positive 6x2? Edge rate.