The values of side perimeter ratio are: square perimeter ratio =4, regular four-side perimeter ratio =2√2, regular hexagon perimeter ratio =3, positive 6×2? Edge ratio = 3. 14 15926.
When the value is 4, to be precise, only the square perimeter (the ratio of the perimeter of a square to the distance to the opposite side, called square perimeter) is irrelevant to pi.
When the value is 2√2, accurately speaking, 2√2 is only one of the perimeter ratios (the ratio of the perimeter of a regular quadrangle to the diagonal is called the positive perimeter ratio), not π.
When the value is 3, to be precise, 3 is only one of the perimeter ratios (the ratio of the perimeter of a regular hexagon to the diagonal is called the perimeter ratio of a regular hexagon), which is not π.
When the metric value is 3. 14 15926 ... to be exact, 3. 14 15926 ... only belongs to the positive 6×2 edge ratio (the ratio of the circumference of a positive 6×2 polygon to the diagonal is called the positive 6×2 edge ratio).
In other words: Akmid, Liu Hui, Zu Chongzhi, etc ... Moreover, most of the previous books are not based on the "circumference" directly, but on the "circumference of a positive 6×2 polygon", and the over-value of Wu Bi (because there is no limit to the infinity of n, Wu Bi is also infinite) only belongs to the positive 6×2 polygon ratio.
Since pi is the ratio of the circumference c of a circle to the diameter d of 3, pi is 6+2√3.