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

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EUTOCII COMMENTARIA IN CONICA. 171<br />

parabolam uocant, in obtusiangulo hyperbolam, in<br />

acutiangulo ellipsim; et sectiones illas apud eos ita<br />

denominatas inuenias. sicut igitur, <strong>cum</strong> ueteres propositionem<br />

de angulis duobus rectis aequalibus in singulis<br />

generibus trianguli inuestigassent, primum in<br />

aequilatero, postea in aequicrurio, deinde uero in scaleno,<br />

recentiores propositionem uniuersalem demonstrauerunt<br />

talem: cuiusuis trianguli tres anguli interiores<br />

duobus rectis aequales sunt [Eucl. I, 32], ita<br />

etiam in coni sectionibus factum est; sectionem enim<br />

rectanguli coni <strong>quae</strong> uocatur in solo cono rectangulo<br />

perscrutabantur secto plano ad latus coni perpendiculari,<br />

sectionem autem coni obtusianguli in cono obtusiangulo,<br />

sectionem autem acutianguli in acutiangulo<br />

oriri demonstrabant in omnibus conis similiter planis<br />

ad latus coni perpendicularibus ductis; id quod ipsa<br />

nomina linearum illarum autiqua docent. postea uero<br />

Apollonius Pergaeus uniuersaliter inuestigauit, in quouis<br />

cono et recto et scaleno omnes sectiones illas oriri<br />

secundum uariam plani ad conum positionem; quem<br />

admirati aequales<br />

ob admiranda theoremata conica ab<br />

eo demonstrata magnum geometram adpellabant.<br />

haec<br />

igitur Geminus iu libro sexto de scientia mathematica;<br />

et <strong>quae</strong> dicit, nos in figuris infra descriptis illustrabimus.<br />

sit ABF triangulus per axem coni positus, et a

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