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

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EUTOCII COMMENTAEIA IN CONICA. 261<br />

z/, Z cadere, sicut apud Apollonium est. sin H<br />

extra E sumitur, et recta ab eo rectae EZ parallela<br />

ducta inter Z, F cadit, punctum ® quinque casus<br />

efficit; aut enim inter z/, B cadit aut in B aut inter<br />

By Z aut in Z aut inter Z, F, sin recta per H<br />

ordinatae parallela ducta in F centrum cadit, rursus<br />

punctum quinque alios casus efficiet eodem modo;<br />

et hic animaduertendum, triangulum a rectis jEz/, EZ<br />

rectis parallelis efi^ectum aequalem fieri triangulo ABF^<br />

nam quoniam est EZ^ : HV^<br />

VI, 19]; nam similes sunt; et<br />

EZ^ : Hr^<br />

= EAZ', H®r [Eucl.<br />

= BZxZA:BrxrA [prop. XXI]<br />

= BZxZA:Br^, erit<br />

E^Z :<br />

demonstrauimus autem, esse<br />

quare etiam E^Z :<br />

H@r =BZxZA: Br\<br />

BZXZA: BF^ = ABZE :<br />

H®r<br />

ABT;<br />

= ABZE: ABT, et permutando.^)<br />

uerum hos casus^) aliter quoque demonstrare<br />

A<br />

possumus dicentes, liaec<br />

in scholio ad prop. XLI<br />

[supra p. 252] de parallelogrammis<br />

esse,<br />

demonstrata<br />

<strong>quae</strong> his triangulis<br />

duplo maiora sunt.<br />

sin recta per H rectae EZ parallela ducta inter<br />

r, A cadit, producetur, donec FE <strong>cum</strong> ea concurrat,

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