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

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CONICORUM LIBER II. 273<br />

nam si fieri potest, etiam alius axis sit KH.<br />

eodem igitur modo, quo antea, ducta perpendiculari<br />

A@ erit AS = ®A [I def. 4]; quare etiam AK=KA<br />

[Eucl. I, 4]. uerum etiam AK = KF [ibid.]. itaque<br />

quod absurdum est.<br />

etiam KA = KF-^<br />

iam circulum AEF in alio puncto inter A^ B, F<br />

<strong>cum</strong> sectione non concurrere, in hyperbola manifestum<br />

AJf<br />

est; in ellipsi autem perpendiculares ducantur FP,<br />

AIl. quoniam igitur est KT = KA (nam radii sunt),<br />

est etiam TK"^ = KA^. est autem<br />

rP^ + PK^ = FK^<br />

et KE^ + ZA^ = AK^ [Eucl. I, 47]. itaque<br />

rP^ + PK^ = AE^ + ZK^<br />

quare FP^ ~ AU^ = UK^ -^- KP\ rursus quoniam<br />

est MPXPN+ PK^ = KM^ [Eucl. II, 5], et etiam<br />

MH XZN + 2JK' = KM^ [ibid.], erit<br />

MPxPN+PK^ = M2XEN+ ZKK<br />

itaque EK^ -^ KP^ = MP X PN MS X -*- 2N.<br />

demonstrauimus autem, esse<br />

UK^ -i- KP^ = rp^ ^ ^2:^5<br />

itaque FP^ _^ 2JA^ = MP x PN H- MS X UN et<br />

quoniam TP, AU ordinate ductae sunt, erit<br />

rP' :MPXPN= AE^ : MZ<br />

X EN [I, 21];<br />

Apollonius, ed. Heiberg. 18

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