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

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CONICORUM LIBER III. 337<br />

nam hoc qmdem manifestum est,<br />

AA ab E® in duas<br />

partes aequales secari [II, 39], et ES diametrum esse<br />

K <strong>cum</strong> ea coniugatam,<br />

<strong>quae</strong> per @ rectae<br />

A/i parallela ducitur<br />

[II, 38]; quare<br />

^if ad iifJ5? ordinate<br />

ducta est [I def. 6].<br />

iam quoniam HE<br />

diametrus est, et contingit AE, ordinate autem ducta<br />

est AHj et sumpto in sectione puncto B ad EH<br />

ductae sunt BZ rectae AH parallela et 5ikr rectae<br />

AE parallela, adparet, esse BMZ = A@Z -\- ®AE<br />

[I, 45] 1). ergo etiam BZM= AKA + KZE.<br />

et simul demonstratum est, esse BKEM = AKA.<br />

XII.<br />

lisdem positis si in altera sectione duo puncta<br />

sumuntur, et ab utroque parallelae ducuntur, eodem<br />

modo quadranguli ab iis efiPecti aequales erunt.<br />

sint enim eadem, <strong>quae</strong> antea, et in AB sectione<br />

puncta <strong>quae</strong>libet sumantur 5, K, et per ea ducantur<br />

1) In secunda figura ex I, 43 erit'<br />

BMZ = A®Z -^ @AE = KZE -i- AKA.<br />

et hoc significat illud dicccpiQEL.<br />

Apollonius, ed. Heiberg. 22

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