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

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CONICORUM LIBER III. 403<br />

Nr : r® = AN : BH + PH = JN : PS est autem<br />

P^=^J®, quoniam etiam F® = BF [II, 12] et<br />

MB = ^0. itaque NT: T® = NA : A®. uerum<br />

Nr:r® = NZ:Ze [Eucl. VI, 1] == AH:H&<br />

[Eucl. VI, 2J, et<br />

NA:A@ = NP: P® [Eucl. VI, 1]<br />

= AK:K@ [Eucl. VI, 4; V, 12, 16].<br />

ergo etiam AK : K& = AH : H@.<br />

XXXVII.<br />

Si duae rectae coni sectionem uel ambitum circuli<br />

uel sectiones oppositas contingentes concurrunt, et ad<br />

puncta contactus earum recta ducitur, a puncto autem<br />

concursus contingentium recta ducitur lineam in duobus<br />

punctis secans, erunt, ut tota ad partem extrinsecus<br />

abscisam, ita partes a recta puncta contactus coniungenti<br />

effectae.<br />

z<br />

^<br />

sit coni sectio AB contingentesque AT^ TB^ et<br />

ducatur AB^ ducaturque TAEZ. dico, esse<br />

TZ:TA = ZE: EA.<br />

per F, A diametri sectionis ducantur I"0, AK^<br />

Praeter nostras figuras duas habet V alios casus in oppo-<br />

repraesentantes.<br />

26*<br />

sitis

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