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Apollonii Pergaei quae graece exstant cum ... - Wilbourhall.org

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CONICORUM LIBER I. 109<br />

sit hyperbola uel ellipsis uel ambitus circuli, cuius<br />

diametrus sit AB, contingat autem J^z/, et ordinate<br />

ducatur FE. dico, esse BE : EA = 5z/ : ^JA.<br />

nam si minus, sit £ z/ : zfA = BH: HA, et ordinate<br />

ducatur HZ. itaque recta a z/ ad Z ducta sectionem<br />

continget [prop. XXXIV]; producta igitur <strong>cum</strong> jTz/<br />

concurret. itaque duarum rectarum iidem termini<br />

erunt;<br />

quod absurdum est.<br />

dicO; inter sectionem et rectam Fz/ nullam rectam<br />

incidere.<br />

nam si fieri potest, incidat ut F0, et fiat<br />

B®:®A = BH:HA^<br />

ordinateque ducatur HZ\ recta igitur a ad Z ducta<br />

producta concurret <strong>cum</strong> &T. itaque duarum rectarum<br />

iidem termini erunt; quod fieri non potest. ergo in<br />

spatium inter sectionem et rectam Fz/ nulla recta<br />

incidet.<br />

XXXVII.<br />

Si recta hyperbolam uel ellipsim uel ambitum<br />

circuli contingens <strong>cum</strong> diametro concurrit, et a puncto<br />

contactus ad diametrum recta ordinate ducitur, recta<br />

ab ordinate ducta ad centrum sectionis abscisa <strong>cum</strong><br />

recta a contingenti ad centrum sectionis abscisa spatium<br />

corr. p. 20. X^"\ p, om. V, m. 2 v. 22. avfiniTCTSi V; corr.<br />

m. 1. 27. Tov] cp, corr. ex rijg m. 1 V.

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