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

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269249LIBER III. FI, ad omnia quadrata circuli, vel ellipſis, CFEH, eſſe
vt cylindricum ſub, MI, &
portione, TCFE Y, vna cum,
{1/6}, cubi, TY, pro circulo, pro ellipſi verò, vna cum ſæpius
dicta parte cubi, TY, vel parallelepipedi ſub, RV, &
rhom-
bo, RZ, ad, {2/3}, parallelepipedi ſub, AD, &
parallelogram-
mo, AQ, ideſt, in circulo ad, {1/6}, cubi, FH.
Omnia . n. quadrata figurę, LCFE G, demptis omnibus quadra-
tis trilineorum, CLT, YGE, ad omnia quadrata, AG, ſunt vt cy-
lindricus ſub, MI, &
portione, TCFE Y, vna cum, {1/6}, cubi, TY,
1122. huius. pro circulo, pro ellipſi verò, vna cum ſæpius dicta parte cubi, TY.
vel dicti parallelepipedi, ad parallelepipedum ſub, LA, & paralle-
logrammo, AG;
omnia verò quadraca, AG, ad omnia quadrata,
AQ, ſunt vt quadratum, AL, ad quadratum, AD, .
i. ſumpta, A
229. Lib. 2. P, communi altitudine, vt parallelepipedum ſub, PA, &
quadra-
to, AL, ad parallelepipedum ſub, PA, &
quadrato, AD, hoc eſt,
vt parallelepipedum ſub, LA, &
parallelogrammo, AG, ad paral-
lelepipedum ſub, DA, &
parallelogrammo, AQ, omnia autem qua-
drata, AQ, omnium quadratorum circuli, vel ellipſis, CFEH, ſunt
33Coroll. 1.
huius.
ſexquialtera .
i. ſunt ad ea, vt parallelepipedum ſub, AD, & paral-
lelogrammo, AQ, ad eiuſdem, {2/3}, ergo ex æquali omnia quadrata
figuræ, LCFE G, demptis ommbus quadratis trilineorum, CLT,
YGE, ad omnia quadrata circuli, vel ellipſis, CFEH, erunt vt
cylindricus ſub, MI, &
portione, TCFEY, vna cum, {1/6}, cubi, T
Y, pro circulo, pro ellipſi verò, vna cum ſæpius dicta parte cubi, T
Y, vel parallelepipedi ſub, RV, &
rhombo, RZ, ad, {2/3}, parallele-
pipedi ſub, AD, &
parallelogrammo, AQ, . i. pro circulo ad, {2/3},
cubi, AD, vel cubi, FH, quod oſtendere opus erat.
THEOREMA XXVIII. PROPOS. XXIX.
SIparallelogrammo ſit inſcripta figura quæcunque, ita ta-
men, vt, ſumpto vno laterum parallelogrammi pro re-
gula, &
, ductis vtcunque ipſiregulæ parallelis intra paralle-
logrammum, earum quælibet, vel tota ſit intra figuram in-
ſcriptam, vel eiuſdem aliqua parte extra figuram exiſtente,
ac ad vnum laterum parallelogrammi terminante, ad latus
eiuſdem parallelogrammi prædicto oppoſitum terminet alia
portio eiuſdem, regulæ æquidiſtantis, ſint autem duæ

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