Theodosius <Bithynius>; Clavius, Christoph
,
Theodosii Tripolitae Sphaericorum libri tres
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modo aberrat, quod dicitur, a ſcopo. </
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<
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xml:space
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lum eodem genere quantitatis contineri, hoc eſt, vtrumque angulum pla-
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num eſſe; </
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<
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xml:space
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">quod acutus angulus rectilineus, vel etiam rectus conſtare poſ-
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ſit ex angulo contactus, & </
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<
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<
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xml:space
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">quod neque ego, neque vllus
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vnquam Geometra negauit. </
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<
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xml:space
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">Ego angulos illos eiuſdem eſſe generis nega-
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">Angulus
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contactus,
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& rectili-
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neus curdi
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cantur eſſe
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diuerſi g@-
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neris.</
note
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ui hac ſolum de cauſa, quòd angulus contactus quantumuis multiplicatus
<
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angulum acutum rectilineum ſuperare nequeat, vt in ſcholio propof. </
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<
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<
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<
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<
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<
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xml:space
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">Hinc enim fit, vt alter ad alterum proportionem
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non habeat, atque adeo quodammodo diuerſi generis ſint: </
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<
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dum eadẽ de cauſa linea recta finita, & </
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<
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xml:space
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">infinita non cenſentur eſſe eiuſdem
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generis, cum altera ad alteram proportionem non habeat; </
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<
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eodem genere magnitudinis; </
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Hoc itaque feriat, vt collimaſſe videatur: </
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">quamquam vt omnia faciat, col-
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limabit nunquam; </
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<
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xml:space
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">ita longè abeſt, quod eſt propoſitum. </
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<
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xml:space
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">Magnitudines au-
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tem, quarum altera multiplicata alteram ſuperare nequit, non cenſeri eiu-
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ſdem generis, (quod ad proportionem attinet) licet ſub eodẽ genere quan
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titatis, hoc eſt, ſub longitudine, aut latitudine, aut profunditate, aut nume-
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ro, collocentur, liquido conſtat ex defin. </
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<
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<
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<
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xml:space
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">vbi Euclides ſatis perſpi-
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cue explicat, cuiuſmodi debeant eſſe magnitudines eiuſdem generis, inter
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quas proportio reperitur. </
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<
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xml:space
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">Quare viderint alij, Peletarius homo conſide
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ratus quam cogitatè me incogitantem hominem appellarit; </
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<
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cte intellexerim, quæ magnitudines ſint eiuſdẽ generis, quæ non ſint. </
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<
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quam enim dixi (id quod mihi affinxit, vt carperet) duarum magnitudi-
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num, quæ ſub diuerſis quãtitatis generibus collocantur, quales ſunt linea,
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ſuperficies, corpus, ac numerus, alterutram ita poſſe multiplicari, vt alte-
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ram ſuperet: </
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<
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">In quo, nẽmine reluctante, fruſtra ſeſe fatigat, vt doceat, id
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fieri non poſſe; </
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<
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">ſed de illis duntaxat magnitudinibus ſum locutus, quæ cum
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in eodem genere quantitatis verſentur, diuerſi tamen generis cenſeri poſ-
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ſunt: </
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nea recta, & </
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">Hæ etenim ita differre inter ſe videntur, vt Ariſtote-
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les liquido affirmarit, vnam alteri æqualem eſſe non poſſe: </
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ce Ariftotelis dictum ſit) verum vſquequaque non eſt; </
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<
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">cum Archimedes
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in lib. </
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">de lineis ſpiralibus demonſtrauerit, quænam linea recta æqualis poſ
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ſit eſſe circunferentiæ cuiuſuis circuli dati. </
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<
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tarius, aut quiſquam alius, ab Euclide defin. </
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<
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<
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">aliquas quantitates
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a proportionis definitione excludi, diuerſique propterea eſſe quodammo-
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do generis, quod ad proportionem attinet, licet in eodem magnitudinis
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genere ponantur: </
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<
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nea item recta finita, & </
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in eadem definitione proportionis, quas plerique excludebant; </
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di ſunt curuilinea ſuperficies, & </
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cta, vt paulo ante diximus, latiuſque in defin. </
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<
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<
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<
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Peletarius, ne opinionem illam ſuam, quam de angulo contactus ſemel im-
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biberat, deſerere cogeretur, noluit hanc expoſitionem quintæ defin. </
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