Apollonii Pergaei quae graece exstant cum ... - Wilbourhall.org
Apollonii Pergaei quae graece exstant cum ... - Wilbourhall.org Apollonii Pergaei quae graece exstant cum ... - Wilbourhall.org
B 188 COMMENTARIA ANTIQUA. TQOV t6 P, xal 6rj^et6v xl ^eT^coQOv t6 ^, xal im- ^evx&etaa rj z/5 expepirjad-co elg aiteiQOV fqp' exdteQa ^eQf} (og enl xa E, Z. eav drj ^evovrog tov ^ 7] zJ (peQYitaL^ ecog av tb B eve%%^ev xatcc tfjg rot) y4B 5 TCvxXov TteQLfpeQeCag eTtl tb avtb tcccXlv dTtoxataOtad-y, o&ev 7]Q^ato cpeQeG&aL, yevvTjCeL eiticpdveLdv tLva, TjtLg 0vy%eLxaL e% 8vo ijtLipaveLcov djtto^evcov dklrikcov xatd tb z/, tjv Tcal KaXet kcovikt^v eTtLcpdveLav. (pricl de, oxL xal elg ccTteLQOv av^etat dLa tb xal trjv 10 yQd(pov0av avttjv evd^etav olov tr^v ^B eig diteLQOV eycpdXXeod-aL. xoQvcpriv de trjg eTtLCpaveCag XeyeL xb z/, d^ova de xrjv z/F. iccovov de keyeL xb TteQLexofievov
EUTOCII COMMENTARIA IN CONICA. 189 ( centrum sit rj et punctum aliquod sublime ^d, ductaque z/5 in infinitum producatur in utramque partem ut ad Ey Z. si igitur manente A mouebitur ^JB, donec 5 per ambitum circuli AB circumactum rursus ad eundem locum perueniat, unde moueri coeptum est, superficiem quandam efficiet, quae ex duabus superficiebus inter se in z/ tangentibus composita est, quam superficiem conicam uocat. dicit autem [I p. 6, 9 sq.], eam in infinitum crescere, quod recta eam describens ut z/J5 in infinitum producatur. uerticem autem superficiei punctum z/ uocat et axem z/F [I p. 6, 11 sq.]. conum autem uocat [I p. 6, 14 sq.] figuram comprehensam circulo ^jB et superficie, quam describit recta z/5 sola, uerticem autem coni z/, axem autem z/F, basim autem circulum AB, et si AV ad circulum AB perpendicularis est, conum rectum uocat [I p. 6, 20 sq.], sin perpendicularis non est, obliquum; obliquus autem conus orietur, si sumpto circulo a centro rectam erexerimus ad planum circuli non perpendicularem, et a puncto sublimi rectae erectae ad circulum rectam duxerimus ductamque rectam per circulum circumegerimus manente eo puncto, quod ad punctum sublime rectae erectae positum est; nam figura ita comprebensa conus erit obliquus.
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B<br />
188 COMMENTARIA ANTIQUA.<br />
TQOV t6 P, xal 6rj^et6v xl ^eT^coQOv t6 ^, xal im-<br />
^evx&etaa rj z/5 expepirjad-co elg aiteiQOV fqp' exdteQa<br />
^eQf} (og enl xa E, Z. eav drj ^evovrog tov ^ 7] zJ<br />
(peQYitaL^ ecog av tb B eve%%^ev xatcc tfjg rot) y4B<br />
5 TCvxXov TteQLfpeQeCag eTtl tb avtb tcccXlv dTtoxataOtad-y,<br />
o&ev 7]Q^ato cpeQeG&aL, yevvTjCeL eiticpdveLdv tLva,<br />
TjtLg 0vy%eLxaL e% 8vo ijtLipaveLcov djtto^evcov dklrikcov<br />
xatd tb z/, tjv Tcal KaXet kcovikt^v eTtLcpdveLav.<br />
(pricl de, oxL xal elg ccTteLQOv av^etat dLa tb xal trjv<br />
10 yQd(pov0av avttjv evd^etav olov tr^v ^B eig diteLQOV<br />
eycpdXXeod-aL. xoQvcpriv de trjg eTtLCpaveCag XeyeL xb z/,<br />
d^ova de xrjv<br />
z/F.<br />
iccovov de keyeL xb TteQLexofievov