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

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CONICORUM LIBER lY. 57<br />

sint oppositae sectiones z/, AEFZ, sitque ABZ<br />

coni sectio uel arcus circuli <strong>cum</strong> altera oppositarum<br />

concurrens in duobus punctis A^ Zj et ABZ, ATZ sectiones<br />

concaua ad easdem partes habeant.<br />

dico, lineam<br />

ABZ productam <strong>cum</strong> /i non concurrere.<br />

ducatur enim AZ. et quoniam A^ATZ oppositae<br />

sunt, et recta ^Z in duobus punctis hyperbolam secat,<br />

producta <strong>cum</strong> opposita ^ non concurret [II, 33].<br />

ergo ne linea ABZ quidem <strong>cum</strong> A concurret.<br />

XXXVII.<br />

'<br />

Si coni sectio uel arcus circuli <strong>cum</strong> altera oppositarum<br />

concurrit, <strong>cum</strong> reliqua earum nou concurret<br />

in pluribus punctis quam in duobus.<br />

sint oppositae A^<br />

B^ et <strong>cum</strong> A concurrat<br />

coni sectio uel<br />

arcus circuli ABT<br />

secetque oppositam<br />

B in Bj T dico, eam<br />

<strong>cum</strong> BTin nullo alia<br />

puncto<br />

concurrere.<br />

nam si fieri potest, concurrat in A. BTA igitur<br />

<strong>cum</strong> sectione BT m pluribus punctis quam in duobus<br />

concurrit concaua ad easdem partes non habens<br />

[prop. XXXVI]; quod fieri non potest [prop. XXXV].<br />

similiter autem demonstrabimus, etiam si linea<br />

ABT oppositam contingit.

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