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

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CONICORUM LIBER III. 373<br />

iam uero S intra angulum 2JEK uel 0ET positum<br />

sit. itaque eodem modo propter compositionem rationum<br />

erit JE^ : EA^<br />

= nS X iBjNiKSx S&.<br />

est autem 77M X MN = zJE^ [II, 11] == PNx NM<br />

[II, 16], et A®X®Z=^ AE^- [II, 11, 16]. itaque<br />

est PNxNM:A0X&Z^nSx:E;N:KSxS&.<br />

quare etiam reliquum [u. Pappi lemma V, 1]<br />

PlSjxlElM: AE' --h KSxS® = ^E^ : EA^<br />

[Eucl. V, 19]. demonstrandum igitur, esse<br />

zsxSA + (AE' ^k;s;xS&) = 2 AE\<br />

auferatur, quod commune est, AE^ — Z0 X 0A.<br />

itaque reliquum est, ut demonstremus, esse [u. Pappi<br />

lemma V, 2] KSx S& + {AE'~^ KSxS&) = AE\<br />

et est; nam KSx S& + AE^ ~KSx S® = AE\<br />

XXV.<br />

lisdem suppositis punctum concursus rectarum<br />

rectis AF, B^ parallelarum intra alterutram sectionum<br />

z/, B positum sit, sicut infra descriptum est, in ^.<br />

dico, rectangulum comprehensum partibus rectae<br />

diametro transaersae parallelae^ hoc est OSxSNj<br />

x6 uTto idE TtQog t6 ccTeh EA Halley praeeunte Commandino.<br />

18. Tov — 19. AE] bis V; corr. pc.

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