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

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195175LIBER II. abſciſſarum, BM, adiuncta, MZ, & omnes lineas, BO, æquari ma-
ximis
abſciſſarum, BM, adiuncta, ME, &
omnes lineas trapezij, A
HNC
, æquari omnibus abſciſſis, BM, adiuncta, MZ, &
omnes lineas
trapezij
, BMNC, æquari omnibus abſciſſis ipſius, BM, adiuncta, M
E
, quorum exemplum patere poteſt in recta, HO, in qua, HO, æquatur
ipſi
, BZ, &
, HN, ipſi, MZ, & , MN, ipſi, ME, æquari autem ſu-
pradicta
ſic intellige, vt ſemper cuilibet aſſumptæ in parallelogrammo,
AO
, reperiatur ſibi æqualis reſpondens in recta, BZ, &
ſic cuilibet aſ-
ſumptæ
in trapezijs iam dictis, reperiatur illi æqualis correſpondens in
recta
, BZ, quæ erit vna abſciſſarum, BM, adiuncta, MZ, vel, ME,
ea
nempè, que terminatur ad idem punctum, per quod tranſit ea, quæ
æquidiſtat
ipſi, DF, &
cum eadem comparata illi reperitur æqualis (ſic
autem
intellige in cæteris, cum dicimus omnes lineas alicuius figuræ,
quæ
eſt parallelogrammum, vel trapezium, vel triangulum æquari om-
nibus
abſciſſis, vel maximis, vel reſiduis omnium abſciſſarum alicuius
lineæ
, adiuncta, vel non adiuncta aliqua linea.)
Rectangula ergo ſub
maximis
abſciſſarum, BM, adiuncta, MZ, &
ſub maximis abſciſſarum,
BM
, adiuncta, ME, ad rectangula ſub omnibus abſciſſis, BM, adiun-
cta
, MZ, &
ſub omnibus abſciſſis, BM, adiuncta, ME, erunt vt re-
ctangulum
ſub, HO, OM, ideſt ſub, ZB, BE, ad rectangulum ſub, H
O
, MN, vnà cum rectangulo ſub compoſita ex, {1/2}, HM, &
, {1/3}, NO,
&
ſub, NO, ideſt ad rectangulum ſub, ZB, ME, vna cum rectangulo
ſub
compoſita ex, {1/2}, ZE, &
, {1/3}, MB, & ſub, MB.
THEOREMA XXXII. PROPOS. XXXII.
EXpoſita adhuc antecedentis Theorematis figura, ſi ipſi,
EF
, ad punctum, F, iungatur in directum quædam re-
cta
linea, vt, FS, &
compleatur parallelogrammum, FR, re-
gula
ſumpta, DS, oſtendemus rectangula ſub, AE, ER, ad
rectangula
ſub trapezijs, ADEC, CESR, eſſe vt rectan-
gulum
, DES, ad rectangulum ſub, DE, &
compoſita ex, S
F
, &
, {1/2}, FE, vna cum rectangulo ſub, EF, & compoſita ex,
{1/6}, EF, &
, {1/2}, FS.
Rectangula enim ſub, AE, ER, ad rectangula ſub, AE, & tra-
11Coroll .1.
26
. huius.
pezio, CESR, ſunt vt, ER, ad trapezium, CESR, .
i. vt, ES,
ad
, SF, cum, {1/2}, FE, .
i. tumpta, DE, communi altitudine, vt re-
2220. huius.
5
. huius.
ctangulum, DES, ad rectangulum ſub, DE, &
ſub compoſita ex,
SF
, &
, {1/2}, FE, quod ſerua.

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