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

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CONICORUM LIBER L 51<br />

BKX KFj et in sectione sumatur<br />

^E : E® = AK^ :<br />

punctum aliquod yl^ et per A rectae ZH parallela<br />

ducatur AM. dico, AM quadratam aequalem esse<br />

spatio rectae E® adplicato, quod latitudinem habeat<br />

EM et figura deficiat simili rectangulo JEx E®.<br />

ducatur enim z/0, et per Mrectae 0£Jparallela ducatur<br />

MlSlNj per ®, ^ autem rectae EM parallelae ducantur<br />

®Nj SOj et per M rectae BF parallela ducatur 11MR<br />

iam quoniam 11P rectae BF parallela est, et etiam<br />

AM rectae ZH parallela, planum reetarum AM, HP<br />

plano rectarum ZH, BF parallelum est [Eucl. XI, 15],<br />

hoc est basi coni. itaque si per AM^ TIP planum<br />

ducitur, sectio circulus erit, cuius diametrus erit HP<br />

[prop. IV]. et ad eam perpendicularis est AM\ itaque<br />

erit AM^ = HMx MP. et quoniam est<br />

et<br />

et<br />

AK^ :BKxKr=EJ: E®,<br />

est<br />

AK^ :BKxKr= (AK : KB)<br />

x (AK : Kr\<br />

est<br />

AK:KB = EH:HB = EM:Mn [Eucl. VI, 4],<br />

AK:Kr= AH:Hr= zJM:MP [ib.],

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