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(周(zhōu )径(jìng )，周(zhōu )径(jìng ))

指(zhǐ )律(lǜ )孔(kǒng )圆(yuán )周(zhōu )与(yǔ )直(zhí )径(jìng )的(de )比(bǐ )值(zhí )。

《汉(hàn )书(shū )·律(lǜ )曆(lì )志(zhì )上(shàng )》：“《易(yì )》曰(yuē )：‘参(cān )天(tiān )两(liǎng )地(dì )而(ér )倚(yǐ )数(shù )。’天(tiān )之(zhī )数(shù )，始(shǐ )于(yú )一(yī )，终(zhōng )于(yú )二(èr )十(shí )有(yǒu )五(wǔ )……繇(yáo )此(cǐ )之(zhī )义(yì )，起(qǐ )十(shí )二(èr )律(lǜ )之(zhī )周(zhōu )径(jìng )。”

颜(yán )师(shī )古(gǔ )注(zhù )引(yǐn )孟(mèng )康(kāng )曰(yuē )：“律(lǜ )孔(kǒng )径(jìng )三(sān )分(fèn )，参(cān )天(tiān )之(zhī )数(shù )也(yě )；围(wéi )九(jiǔ )分(fèn )，终(zhōng )天(tiān )之(zhī )数(shù )也(yě )。”

宋(sòng )沉(chén )括(kuò )《梦(mèng )溪(xī )笔(bǐ )谈(tán )·象(xiàng )数(shù )二(èr )》：“律(lǜ )有(yǒu )多(duō )寡(guǎ )之(zhī )数(shù )，有(yǒu )实(shí )积(jī )之(zhī )数(shù )，有(yǒu )短(duǎn )长(zhǎng )之(zhī )数(shù )，有(yǒu )周(zhōu )径(jìng )之(zhī )数(shù )，有(yǒu )清(qīng )浊(zhuó )之(zhī )数(shù )。”

清(qīng )江(jiāng )藩(fān )《毛(máo )乾(qián )乾(qián )传(chuán )》：“与(yǔ )文(wén )鼎(dǐng )论(lùn )周(zhōu )径(jìng )之(zhī )理(lǐ )，方(fāng )圆(yuán )相(xiàng )容(róng )相(xiàng )变(biàn )诸(zhū )率(lǜ )。”

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●周径（简体版）