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

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

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CONICOEUM LIBER IV. 13<br />

ne cadat emm, sed, si fieri potest, sit BH. itaque<br />

erit [III, 35]<br />

rJ:^E=rH:HEquod<br />

fieri<br />

non potest.<br />

VI.<br />

Si extra hyperbolam punctum aliquod sumitur, ab<br />

ecque ad sectionem duae rectae perducuntur, quarum<br />

altera contingit, altera alterutri asymptotarum parallela<br />

est, et rectae de parallelo inter sectionem punctumque<br />

abscisae aequalis recta in ea producta intra sectionem<br />

ponitur, recta a puncto contactus ad punctum<br />

ita ortum ducta <strong>cum</strong> sectione concurret, et recta a<br />

puncto concursus ad punctum extrinsecus positum<br />

ducta<br />

sectionem continget.<br />

sit hyperbola AEB, et extrinsecus sumatur punctum<br />

aliquod z/, et prius z/ positum sit intra angulum<br />

ab asymptotis comprehensum,<br />

ab eoque contingat 5z/, ^EZ<br />

autem alteri asymptotae sit<br />

parallela, ponaturque EZ = JE,<br />

rectam a 5 ad Z ductam<br />

dico,<br />

<strong>cum</strong> sectione concurrere, et rectam<br />

a puncto concursus ad z/<br />

ductam sectionem<br />

contingere.<br />

ducatur enim ^A sectionem contingens, et ducta<br />

BAj si fieri potest, rectam ^E in Z ne secet, sed<br />

in alio puncto H. erit igitur ^E = EH [III, 30];<br />

quod absurdum est; supposuimus enim, esse<br />

^E = EZ.

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