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Euclid: Elementa

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eng
The straight line drawn at right angles to the diameter of a circle from its extremity will fall outside the circle, and into the space between the straight line and the circumference another straight line cannot be interposed; further the angle of the semicircle is greater, and the remaining angle less, than any acute rectilineal angle.
lat Clavius p. 238
QVÆ ab extremitate diametri cuiusque circuli ad angulos rectos ducitur, extra ipsum circulum cadet; & in locum inter ipsam rectam lineam, & peripheriam comprehensum, altera recta linea non cadet. & semicirculi quidem angulus, quouis angulo acuto rectilineo maior est; reliquus autem minor.
kin 幾何原本 p. 139
三支
圜徑末之直角線。全在圜外。而直線偕圜界、所作切邊角。不得更作一直線。入其內。其半圜分角。大於各直線銳角。切邊角。小於各直線銳角。
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