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两(liǎng )直(zhí )线(xiàn )垂(chuí )直(zhí )相(xiàng )交(jiāo )所(suǒ )成(chéng )的(de )角(jiǎo )，直(zhí )角(jiǎo )为(wéi )九(jiǔ )十(shí )度(dù )。

《周(zhōu )礼(lǐ )·地(dì )官(guān )·保(bǎo )氏(shì )》“六(liù )曰(yuē )九(jiǔ )数(shù )”清(qīng )孙(sūn )诒(yí )让(ràng )正(zhèng )义(yì )：“凡(fán )三(sān )角(jiǎo )，必(bì )有(yǒu )三(sān )边(biān )……西(xī )法(fǎ )偃(yǎn )之(zhī )，号(hào )为(wéi )直(zhí )角(jiǎo )也(yě )。”

清(qīng )江(jiāng )藩(fān )《国(guó )朝(cháo )汉(hàn )学(xué )师(shī )承(chéng )记(jì )·戴(dài )震(zhèn )》：“今(jīn )人(rén )所(suǒ )用(yòng )三(sān )角(jiǎo )八(bā )线(xiàn )之(zhī )法(fǎ )，本(běn )出(chū )于(yú )勾(gōu )股(gǔ )……三(sān )角(jiǎo )中(zhōng )无(wú )直(zhí )角(jiǎo )，则(zé )不(bú )应(yīng )乎(hū )矩(jǔ )。”

老(lǎo )舍(shě )《二(èr )马(mǎ )》第(dì )二(èr )段(duàn )五(wǔ )：“老(lǎo )马(mǎ )先(xiān )生(shēng )坐(zuò )着(zhe )的(de )姿(zī )式(shì )，正(zhèng )和(hé )小(xiǎo )官(guān )儿(ér )见(jiàn )上(shàng )司(sī )一(yī )样(yàng )规(guī )矩(jǔ )：嵴(jí )梁(liáng )背(bèi )儿(ér )正(zhèng )和(hé )椅(yǐ )子(zǐ )垫(diàn )成(chéng )直(zhí )角(jiǎo )，两(liǎng )手(shǒu )拿(ná )着(zhe )劲(jìn )在(zài )膝(xī )上(shàng )摆(bǎi )着(zhe )。”

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●直角（简体版）