Apollonii Pergaei quae graece exstant cum ... - Wilbourhall.org
Apollonii Pergaei quae graece exstant cum ... - Wilbourhall.org Apollonii Pergaei quae graece exstant cum ... - Wilbourhall.org
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EUTOCII COMMENTARIA IN CONICA. 233 penuriam instrumentorum non inutile uidetur interdum etiam per puncta continua coni sectiones in plano describere, per hanc propositionem fieri potest, ut continua puncta comparentur, per quae parabola describatur regula adposita. si enim rectam posuero ut j4B [u. fig. I p. 73] in eaque puncta continua sumpsero ut Ef Z et ab iis ad rectam AB perpendiculares erexero ut EFj Z/1 sumpto in ET puncto aliquo F, si parabolam latiorem efficere uoluero, ab E remoto, sin angustiorem, propius, et fecero ET^\ZA^ = AE\AZ, puncta F, A in sectione erunt. et similiter alia quoque sumemus, per quae parabola describetur. Propositio satis Ad prop. XXI. clare exposita est nec casum habet; animaduertendum autem, parametrum siue latus rectum in circulo diametro aequalem esse. nam si /lE'^ : AEXEB = TA: AB et in solo circulo ^E^ = AE X EB, erit etiam TA == AB. sciendum autem hoc quoque, rectas in ambitu circuli ordinate ductas omnino perpendiculares esse ad diametrum et positas in productis rectis rectae AT parallelis. per hanc uero propositionem eadem ratione usi, quam in parabola commemorauimus [ad prop. XX], corr. Comm. 10. E] A Wp, corr. Comm. 13. Xrjipc6(is&cc W, sed corr. m. 1. 18. i^] addidi, om. Wp. iariv W. 19. iati, p. 20. dno] om. Wp, corr. Comm. 28. yQacpofiSv] fort. yQciipoiisv.
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EUTOCII COMMENTARIA IN CONICA. 233<br />
penuriam instrumentorum non inutile uidetur interdum<br />
etiam per puncta continua coni sectiones in plano<br />
describere, per hanc propositionem fieri potest, ut<br />
continua puncta comparentur, per <strong>quae</strong> parabola describatur<br />
regula adposita. si enim rectam posuero ut<br />
j4B [u. fig. I p. 73] in eaque puncta continua sumpsero<br />
ut Ef Z et ab iis ad rectam AB perpendiculares<br />
erexero ut EFj Z/1 sumpto in ET puncto aliquo F,<br />
si parabolam latiorem efficere uoluero, ab E remoto,<br />
sin angustiorem, propius, et fecero<br />
ET^\ZA^ = AE\AZ,<br />
puncta F, A in sectione erunt. et similiter alia quoque<br />
sumemus, per <strong>quae</strong> parabola describetur.<br />
Propositio satis<br />
Ad prop. XXI.<br />
clare exposita est nec casum habet;<br />
animaduertendum autem, parametrum siue latus rectum<br />
in circulo diametro aequalem esse. nam si<br />
/lE'^ :<br />
AEXEB = TA: AB<br />
et in solo circulo ^E^ = AE X EB, erit etiam<br />
TA == AB.<br />
sciendum autem hoc quoque, rectas in ambitu circuli<br />
ordinate ductas omnino perpendiculares esse ad<br />
diametrum et positas in productis rectis rectae AT<br />
parallelis.<br />
per hanc uero propositionem eadem ratione usi,<br />
quam in parabola commemorauimus [ad prop. XX],<br />
corr. Comm. 10. E] A Wp, corr. Comm. 13. Xrjipc6(is&cc W,<br />
sed corr. m. 1. 18. i^] addidi, om. Wp. iariv W. 19.<br />
iati, p. 20. dno] om. Wp, corr. Comm. 28. yQacpofiSv]<br />
fort. yQciipoiisv.