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

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[Item 1.]
[2.] TURNER COLLECTION
[3.] THE LIBRARY UNIVERSITY OF KEELE
[4.] GEOMETRIA INDIVISIBILIBVS CONTIN VOR VM Noua quadam ratione promota. _AVTHORE_ P. BONAVENTVRA CAVALERIO MEDIOLANEN _Ordinis S.Hieron. Olim in Almo Bononien. Archigym._ _Prim. Mathematicarum Profeſſ._ In hac poftrema edictione ab erroribus expurgata. _Ad Illuſtriſs. D. D._ MARTIVM VRSINVM PENNÆ MARCHIONEM &c.
[5.] BONONIÆ, M. DC. LIII.
[6.] _ILLVSTRISSIME_ MARCHIO
[7.] PRÆFATIO
[8.] In huius Libri Autorem.
[9.] In Librum Geometriæ.
[10.] Ad Libri Auctorem.
[11.] Ad Librum Geometriæ.
[12.] DeLibro Geometriæ.
[13.] De Libro Geometriæ.
[14.] Ad Autorem Libri Geometriæ.
[15.] CAVALERII LIBER PRIMVS. In quo præcipuè de ſectionibus Cylindricorum, & Conicorum, nec non ſimilibus figuris quædam element aria præmittuntur; ac aliquæ Pro-poſitiones lemmaticæ pro ſequen-tibus Libris oſtenduntur. DIFINITIONES. A. I.
[16.] B.
[17.] C.
[18.] A. II.
[19.] B.
[20.] C.
[21.] D.
[22.] E.
[23.] SCHOLIVM.
[24.] III.
[25.] A. IV.
[26.] COROLLARIVM.
[27.] B.
[28.] V.
[29.] VI.
[30.] VII.
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4424GEOMETRIÆ
Sit cylindricus, AE, ſectus a planis quomodocumque per latera.
Dico per eadem diuidi in cylindricos; ſint autem ſecantia plana, quę
in
cylindrico, AE, producant parallelogramma, AE, ME.
Quia
igitur
, AE, eſt parallelogrammum, ſi in ipſo ducantur rectæ lineæ
ipſi
, AD, HE, parallelæ, &
in, AH, DE, terminatæ, erunt ei-
ſdem
, AD, HE, æquales, &
ſubinde erunt æquales, & parallelæ
11Ex def. 3. regulælateris cylindrici, AE, vnde erit, AE, ſuperficies cylindra-
cea
deſcripta latere, AD, ſiue latere cylindrici, AE, ergo ſolidum,
ARXE
, erit cylindricus.
Eodem pacto oſtendemus ſolida, AM
HDVE
, MZHVIE, eſſe cylindricos, talibus igitur planis cy-
lindricus
, AE, ſemper diuiditur in cylindricos, quæ eſt prior pars
huius
Theorematis.
Secetur nunc duobus planis vtcumque inter ſe parallelis coinci-
dentibus
cum omnibus ciuſdem lateribus, quæ in cylindrico, AE,
producant
figuras, BNGK, COFL.
Dico ſolidum compræhen-
18[Figure 18] ſum inter has figuras, &
ijs incluſam ſuperficiem
cylindraceam
, eſſe cylindricum.
Sintadhuc pla-
na
per latera cylindrici, AE, vtcumque ducta, A
E
, ME, quæ ſecent figuras, BNGK, COFL,
in
rectis, BG, CF, NG, OF, igitur eiuſdem pla
ni
, &
ipſarum, BNGK, COFL, communes ſe-
ctiones
erunt parallelæ, quę ſint, BG, CF, ſicut
etiam
ipſæ, NG, OF, ſunt autem parallelę etiam
ipſæ
, BC, NO, GF, ergo, BF, NF, erunt pa-
rallelogramma
, &
latera eorumdem, BC, GF,
NO
, inter ſe æqualia, &
æquidiſtantia; ſi igitur
eorum
quoduis, vt, GF, ſtatuatur pro regula lateris ylindrici, ſu-
perficies
incluſa duabus figuris, BNGK, COFL, erit deſcripta
vno
laterum, BC, vel, NO, properante per circuitum figuræ, C
OFL
, ſemper ipſi, GF, æquidiſtante, donec redeat vnde diſceſſit,
igitur
hæc erit ſuperſicies cylindracea, cuius oppoſitæ baſes ipſæ fi-
guræ
, BNGK, COFL, &
ſolidum eiſdem incluſum erit cylindri-
cus
, quod erat poſterior pars huius Theorematis à nobis demon-
22Def. 3.ſtranda.
THEOREMA VIII. PROPOS. XI.
CViuſuis cylindrici oppoſitæ baſes ſunt fimiles, æquales,
&
ſimiliter poſitæ.

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