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

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CONICORUM LIBER lU. 433<br />

nam quoniam /. ^BH, ^SH recti sunt, circulus<br />

cir<strong>cum</strong> diametrum ^H descriptus per 0, B ueniet<br />

[Eucl. III, 31], et LH&B==B^H [Eucl. III, 21].<br />

demonstrauimus autem, esse/.^iiZr=s=5z/i/[prop.XLy];<br />

quare etiam /. B0H= AHr=A&r [Eucl. III, 31,<br />

21]. itaque etiam Lr@H= A@B. uerum LTQH<br />

rectus est; ergo etiam L A®B rectus est.<br />

lisdem positis si a centro sectionis ad contingentem<br />

recta ducitur parallela rectae per punctum contactus<br />

alterumque punctorum ductae, dimidio axi<br />

aequalis<br />

erit.<br />

sint enim eadem, <strong>quae</strong> antea, et centrum sit 0,<br />

ducaturque EZ, et ^P, BA in K concurrant, per @<br />

autem rectae EZ parallela ducatur ®A. dico, esse<br />

@A = ®B.<br />

ducantur enim EH, A A, AH, AB, et per H rectae<br />

EZ parallela ducatur HM. quoniam igitur est<br />

AZxZB = AHx HB [ex hypothesi; cfr. prop XLV],<br />

^^<br />

erit AZ = HB. uerum etiam A& = ®B\ quare<br />

etiam Z®= ®H. itaque etiam EA = ^iVf[EucL VI,2].<br />

Apollonius, ed. Heiberg. 28

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