Cyclotomic continued proportion was the principal method for studies on infinite series in the Qing Dynasty, which we still have to go into a step further.
割圆连比例曾是清代无穷级数研究中所用的主要方法，但对它的研究目前还不够充分。
2
At the same time, Archimedes gives an exact proof on the formula of area of circle, with the method of exhaustion method depending on the Cyclotomic.