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CONICORUM LIBER IV. 27 catur z/jE, et ducta ZE^ si fieri potest/ per T ne cadat, sed per H. erit igitur AA : AB — AH: HB [III, 37];^) quod absurdum est; supposuimus enim, esse A^ : z/5 = jri FB. XVI. lisdem positis ^ punctum positum sit in angulo, qui angulo ab asymptotis comprebenso deinceps positus est, et reliqua eadem fiant. dico, rectam a Z ad F ductam productam cum sectione opposita concurrere, et rectam a puncto concursus ad z/ ductam sectionem oppositam contingere. sint enim eadem, et punctum z/ positum sit in angulo, qui angulo ab asymptotis comprehenso deinceps positus est, ducaturque a z/ sectionem A contingens ^E, et ducatur EZ et producta, si fieri potest, ad r ne ueniat, sed ad H erit igitur [III, 39] ^if:HJ5 = ^z/:z/5; quod absurdum est; supposuimus enim, esse Azi: JB = AT-.rB. XVII. lisdem positis punctum A in alterutra asymptotarum sit positum. dico, rectam a Z ad F ductam parallelam esse asymptotae, in qua punctum positum sit. 1) Quae tum quoque ualet, cum utrumque punctum contactus in eadem opposita est positum, quamquam hic casus in figuris codicis non respicitur, ne in iis quidem, quas I p. 403 not. significaui.
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CONICORUM LIBER IV. 27<br />
catur z/jE, et ducta ZE^ si fieri potest/ per T ne<br />
cadat, sed per H. erit igitur AA :<br />
AB — AH: HB<br />
[III, 37];^) quod absurdum est; supposuimus enim,<br />
esse A^ : z/5 = jri FB.<br />
XVI.<br />
lisdem positis ^ punctum positum sit in angulo,<br />
qui angulo ab asymptotis comprebenso deinceps positus<br />
est, et reliqua eadem fiant.<br />
dico, rectam a Z ad F ductam productam <strong>cum</strong><br />
sectione opposita concurrere, et rectam a puncto concursus<br />
ad z/ ductam sectionem oppositam contingere.<br />
sint enim eadem, et punctum z/ positum sit in<br />
angulo, qui angulo ab asymptotis comprehenso deinceps<br />
positus est, ducaturque a z/ sectionem A contingens<br />
^E, et ducatur EZ et producta, si fieri potest,<br />
ad r ne ueniat, sed ad H erit igitur [III, 39]<br />
^if:HJ5 = ^z/:z/5;<br />
quod absurdum est; supposuimus enim, esse<br />
Azi: JB = AT-.rB.<br />
XVII.<br />
lisdem positis punctum A in alterutra asymptotarum<br />
sit positum.<br />
dico, rectam a Z ad F ductam parallelam esse<br />
asymptotae, in qua punctum positum sit.<br />
1) Quae tum quoque ualet, <strong>cum</strong> utrumque punctum contactus<br />
in eadem opposita est positum, quamquam hic casus<br />
in figuris codicis non respicitur, ne in iis quidem, quas I<br />
p. 403 not. significaui.