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Euclid: Elementa

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4. The height of any figure is the perpendicular drawn from the vertex to the base.
lat Clavius
No Latin
kin 幾何原本 p. 279-280
第四界
度各形之高。皆以垂線之亘為度。
甲乙丙角形。從甲頂、向乙丙底。作甲庚垂線。卽甲庚為甲乙丙之高。又丁戊己角形。作丁辛垂線。卽丁辛為丁戊己之高。若兩形相視。兩垂線等。卽兩形之高、必等。如上兩形在兩平行線之內者是也。若以丙、己、為頂。以甲乙、丁戊、為底。則不等。自餘諸形之度高、俱倣此。(p. 二八○)
凡度物高。以頂底為界。以垂線為度。蓋物之定度。止有一。不得有二。自頂至底。垂線一而己。偏線無數也。
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