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

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CONICORUM LIBER II. 267<br />

in binas partes aequales in Z, ®. et ducta Z® diametrus<br />

sectionis erit [I def. 4]. eodem autem modo<br />

etiam innumerabiles<br />

diametros inueniemus.<br />

XLV.<br />

Datae ellipsis uel liyperbolae centrum inuenire.<br />

boc autem manifestum est. nam si duae diametri<br />

sectionis ducuntur AB, JTz/ [prop. XLIV], ubi inter<br />

se secant, centrum erit sectionis, ut infra descriptum<br />

est.<br />

XLVL<br />

Datae coni sectionis axem inuenire.<br />

sit data coni sectio prius parabola, in qua sunt<br />

Z, F) E. oportet igitur axem eius inuenire.<br />

ducatur enim diametrus eius AB [prop. XLIV].<br />

iam<br />

si ^jB axis est, factum erit propositum; sin minus,<br />

factum sit, et axis sit Fz/; axis igitur F^ rectae AB<br />

parallela est [I, 51 coroll.] et rectas ad eam perpendiculares<br />

ductas in binas partes aequales secat [I def. 7].<br />

rectae autem ad FA perpendiculares etiam Sid AB<br />

perpendiculares sunt; quare FA rectas ad AB perpendiculares<br />

in binas partes aequales secat. iam si<br />

fixero EZ ad AB perpendicularem, positione data<br />

Figuras prop. XLV in prop. XLIY habet V; in prop. XLV<br />

mg. syqacpri xo Gxrjlioc avco m. 1.

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