Cavalieri, Buonaventura - Geometria indivisibilibvs continvorvm : noua quadam ratione promota

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233LIBERI.

11E

REgula appellabitur in planis recta linea, cui quædam
lineæ ducuntur æquidiſtantes, & in ſolidis, planum,
cui quædam plana ducuntur æquidiſtantia, qualis in ſu-
perioribus eſt recta linea, vel planum, cuius reſpectu fu-
muntur vertices, vel oppoſita tangentia, cui vel vtraq; vel
alterum tangentium æquidiſtat.

SCHOLIVM.

_H_Aec minimè diſcrepant ab bis, quæ in Euclide, Archimede,
& Apollonio, circa vertices, baſes, altitudines, & tangen-
tia, ſiuelineas, ſine plana, aſſamuntur; cum, licet vniuerſalius, idem,
quod ipſi, declarent, vt ĳs, qui in ſupra dictorum auctorum opert-
bus verſati ſunt innoteſcet facilè, vnde ſine ſcrupulo aſſumemus
aliquando ex dictis auctoribus, quæ ex conſimilibus difinitionibus
pendent, illis commiſcentes, prout opus fuerit, quæ ex bis dedu-
cuntur.

III.

EXpoſita quacumque figura plana, & in eiuſdem ambitu
ſumpto vt cumque puncto, ab eoque ad alteram eiuf-
dem partium ducta quadam recta linea terminata, & ſuper
planum propoſitæ figuræ eleuata, ſihæc per ambitum talis
figuræ ſemper æquidiſtanter cuidam rectæ lineæ moueri
intelligatur, donec omnem percurrerit ambitum, alterum
eiuſdem extremum punctum, quod non fertur per ambi-
tum propoſitæ figuræ, deſcribet circuitum planæ figuræ
ipſi propoſitæ æquidiſtantis, vt probabitur. Solidum er-
226.huius. go, quod compræhenditur vtriſq. figuris iam dictis, & ſu-
perficie linea quæ reuoluitur, deſcripta, dicetur: Cylin-
dricus; ſuperficies in reuolutione deſcripta, nec non quod
libet illius fruſtum, ſuperficies cylindracea. Cylindrici
oppofitæ baſes dictæ figuræ planæ interſe æquidiſtantes;
latus autem cylindrici, quæuis recta in ſuperficie cylindra-
cea oppoſitas baſes pertingens, cui congruit in

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