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

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EUTOCn COMMENTARIA IN CONICA. 279<br />

et similiter etiam, si<br />

circulus cir<strong>cum</strong> Z^descriptus<br />

rectam AB secat, idem demonstrabitur.<br />

Ad prop. LV.<br />

Et in ^z/ semicirculus describatur AZ/l^<br />

ad semicirculum autem recta ducatur ZH<br />

rectae A® parallela, <strong>quae</strong> faciat<br />

Zfi2 '.AHxHA = rA\ 2AA I p. 172, 8—12]<br />

sit ABF semicirculus in diametro Ar, data autem<br />

jratio EZiZH, et oporteat efficere, quod propositum est.<br />

ponatur Z@ = EZj et @H in K in duas partes<br />

aequales secetur, ducaturque in semicirculo recta<br />

aliqua FB in angulo AFB, et ab A centro ad eam<br />

perpendicularis<br />

ducatur A2J productaque <strong>cum</strong> ambitu<br />

in N concurrat, et per N rectae FB parallela ducatur<br />

NM] ea igitur circulum continget [Eucl. III, 16 coroll.].<br />

et fiat MS :SN=Z® : eK, ponaturque N0 = giV,<br />

et ducantur AS, ^O semicirculum in H, P secantes,<br />

ducaturqne<br />

HPA.<br />

quoniam igitur SN == NO, communis autem et<br />

perpendicularis NA, erit etiam AO = AS [Eucl.1,4].<br />

uerum etiam An=AP., quare etiam reliqua nO=PS.<br />

Iq fig. pro Z hab. E W, pro 71 hab. H (hoc corr. w).

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