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Euclid: Elementa
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11. An obtuse angle is an angle greater than a right angle.
lat Clavius p. 9-10
XI. OBTVSVS angulus est, qui recto maior est.
QVANDO recta A B, rectæ C D, insistens non fecerit angulos ad punctum B, æquales, & obeam causam neutrum rectum, sed vnum quidem recto maiorem, alterum vero minorem, dicitur maior angulus obtusus, qualis est angulus B, ad punctum C, vergens, quicontinetur rectis lineis A B, B C.
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kin 幾何原本 p. 5
第十一界
凡角大于直角。為鈍角。
如甲乙丙角與甲乙丁角不等。而甲乙丙大於甲乙丁。則甲乙丙為鈍角。(p. 六)
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