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(一(yī )中(zhōng )同(tóng )长(zhǎng )，一(yī )中(zhōng )同(tóng )长(zhǎng ))

谓(wèi )每(měi )个(gè )圆(yuán )只(zhī )有(yǒu )一(yī )个(gè )中(zhōng )心(xīn )点(diǎn )，从(cóng )圆(yuán )心(xīn )到(dào )圆(yuán )周(zhōu )作(zuò )直(zhí )线(xiàn )，长(zhǎng )度(dù )都(dōu )相(xiàng )等(děng )。

《墨(mò )子(zǐ )·经(jīng )上(shàng )》：“圜(huán )，一(yī )中(zhōng )同(tóng )长(zhǎng )也(yě )。”

清(qīng )陈(chén )澧(lǐ )《东(dōng )塾(shú )读(dú )书(shū )记(jì )·诸(zhū )子(zǐ )》：“《几(jǐ )何(hé )原(yuán )本(běn )》云(yún )：‘圜(huán )之(zhī )中(zhōng )处(chù )一(yī )圜(huán )心(xīn )，一(yī )圜(huán )惟(wéi )一(yī )心(xīn )，无(wú )二(èr )心(xīn )，圜(huán )界(jiè )至(zhì )中(zhōng )心(xīn )作(zuò )直(zhí )线(xiàn )俱(jù )等(děng )。’即(jí )此(cǐ )所(suǒ )谓(wèi )‘一(yī )中(zhōng )同(tóng )长(zhǎng )’也(yě )。”按(àn )，这(zhè )是(shì )我(wǒ )国(guó )最(zuì )早(zǎo )的(de )几(jǐ )何(hé )学(xué )定(dìng )义(yì )。

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●一中同长（简体版）