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

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CONICORUM LIBER II. 207<br />

j4r in H in duas partes aequales secetur, et<br />

ducatur zJH] ea igitur diametrus sectionis est [prop. VII].<br />

£ itaque recta in B contingens<br />

z<br />

concurrat in E, Z.<br />

rectae AF parallela est<br />

[prop. V — VI]. contingat<br />

igitur @BK. itaque <strong>cum</strong><br />

E/l^AZ concurret [prop.III].<br />

quoniam igitur AT et KB<br />

parallelae sunt, et K& <strong>cum</strong><br />

AK,A® concurrit, etiam AF<br />

<strong>cum</strong> AE, AZ concurret.<br />

et ®B = BKj quare etiam<br />

[Eucl. VI, 4] ZH = HE. ergo etiam TZ = AE.<br />

IX.<br />

Si recta <strong>cum</strong> asymptotis concurrens ab hyperbola<br />

in duas partes aequales secatur, in uno puncto solo<br />

sectionem tangit.<br />

recta<br />

enim TA <strong>cum</strong> asjmptotis TAA concurrens<br />

ab hyperbola in puncto E in duas partes aequales<br />

secetur. dico, eam in nullo alio puncto sectionem<br />

tangere.<br />

nam si fieri potest, tangat in B. itaque TE = BA<br />

[prop. VIII]; quod absurdum est; supposuimus enim,<br />

esse TE = EA. ergo TA in nullo alio puncto<br />

sectionem tangit.<br />

X.<br />

Si recta aliqua sectionem secans <strong>cum</strong> utraque<br />

asymptota concurrit, rectangulum comprehensum rectis<br />

inter asymptotas sectionemque abscisis aequale est<br />

quartae parti figurae ad diametrum effectae, <strong>quae</strong>

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