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

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CONICORUM LIBER I. 73<br />

recta ab A rectae ordinate ductae parallela ducta extra<br />

sectionem cadit [prop XVII], et <strong>cum</strong> illa concurrit<br />

A^j ei BF rectae ordinate ductae parallela est,<br />

etiam<br />

BF <strong>cum</strong> A^ concurret. et siue inter puncta A^ zf<br />

concurrit, manifestum est, eam etiam <strong>cum</strong> sectione<br />

concurrere, siue extra z/ concurrit ut in E, prius<br />

<strong>cum</strong> sectione concurret. ergo recta a B rectae ordinate<br />

ductae parallela ducta <strong>cum</strong> sectione concurret.<br />

XX.<br />

Si in parabola a sectione duae rectae ad diametrum<br />

ordinate ducuntur, erunt, ut quadrata earum inter<br />

est<br />

autem<br />

z/Z^ :<br />

se, ita rectae ab iis e diametro ad<br />

uerticem sectionis abscisae.<br />

sit parabola, cuius diametrus sit<br />

ABj et in ea puncta aliqua samantur<br />

JT, z/, et a JT, ^ ad ^5 ordinate<br />

ducantur FE, AZ. dico, esse<br />

^Z^iTE^^^ZAiAE.<br />

sit enim parametrus AH, est igitur<br />

AZ^ = ZAXAH, rE^ = EAxJH,<br />

FE^ = ZAX AH: EA XAH.<br />

ZAXAH:EAXAH= ZA:AE.<br />

ergo etiam z/Z^ : FE^ == ZA : AE.<br />

XXI.<br />

Si in hyperbola uel ellipsi uel ambitu circuli<br />

rectae ad diametrum ordinate ducuntur, quadrata earum<br />

ad spatia comprehensa rectis ab iis ad terminos lateris

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