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

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\q<br />

CONICORUM LIBER I. 81<br />

ducatur z/Z. /IZ igitur producta <strong>cum</strong> diametro sectionis<br />

concurret [prop. XXII]. concurrat in A. et<br />

TAE inter sectionem et rectam ZAA posita est.<br />

ergo etiam TAE producta <strong>cum</strong> diametro extra sectionem<br />

concurret.<br />

XXV.<br />

Si recta <strong>cum</strong> ellipsi inter ambas diametros concurrens<br />

in utramque partem producta extra sectionem<br />

cadit, <strong>cum</strong> utraque diametro concurret.<br />

sit ellipsis, cuius diametri sint AB^ JTz/, et <strong>cum</strong><br />

ea recta EZ inter ambas diametros concurrat in H<br />

dico, EZ <strong>cum</strong> utraque diaz^^<br />

i<br />

j I<br />

et in utramque partem producta<br />

extra sectionem cadat.<br />

metro AB^ TA concurrere,<br />

ab if ad AB, TA ordinate<br />

ducantur if©, HK. quoniam<br />

HK rectae AB parallela<br />

est, et recta aliqua HZ <strong>cum</strong> HK concurrit, etiam<br />

<strong>cum</strong> AB concurret. et eadem de causa etiam EZ<br />

<strong>cum</strong> Fz/ concurret.<br />

XXVI.<br />

Si in parabola uel hyperbola recta diametro sectionis<br />

parallela ducitur, <strong>cum</strong> sectione in uno puncto<br />

solo<br />

concurret.<br />

sit prius parabola, cuius diametrus sit ABT, latus<br />

autem rectum AA, et rectae AB parallela ducatur EZ,<br />

dico, EZ productam <strong>cum</strong> sectione concurrere.<br />

Apollonius, ed. Heiberg. 6

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