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

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251231LIBER III.
_P_ATET autem omnia quadrata, HT, ad omnia quadrata figure,
BMCP
, eſſe pariter, vt quadratum, BP, ad rectangulum ſub,
BP
, PA, vna cum rectangulo ſub, PA, &
ſub exceſſu, quo dupla,
EI
, ſuperat, EF, cum, {2/3}, quadrati, BA.
Et quoniam, iuncta, BM,
oſtenſum
eſt omnia quadrata, HP, ad omnia quadrata trapezij, MB,
11_28. Lib. 2._ PC, eſſe vt quadratum, BP, adrectangulum, BPA, vna cum {1/3}, qua-
drati
, AB, ideò eadem omnia quadrata, HP, ad reſiduum omnium
quadratorum
figuræ, quæ eiſdem, MCPB, &
curua, MB, contine-
tur
, demptis ab ijſdem omnibus quadratis trapezij, BMCP, erunt vt
idem
quadratum, BP, ad rectangulum ſub, AP, &
ſub exceſſu du-
pla
, EI, ſuper, EF, vnacum, {2/3}, quadrati, BA.
THEOREMA XVIII. PROPOS. XIX.
EXpoſita adhuc figura Propof. 15. & intra circulum, vel
ellipſim
, MBEG, ducta, RV, vtcunq;
regulę, DF,
parallela
, diuidente ipſum circulum, vel ellipſim in duas vt-
cunque
portiones, SMT, SET.
Dico omnia quadrata
portionis
, SMT, cumrectangulis bis ſub eadem portione,
&
ſub quadrilineo, MTVN, ad omnia quadrata portionis,
SET
, cum rectangulis bis ſub eadem portione, &
ſub tri-
lineis
, TGV, GEF, eſſe vt portio, SMT, ad portionem,
SET
.
Quoniam . n. rectangula ſub portione, SMT, & parallelogram-
22Coroll. 1.
26
. lib. 2.
per
A. 23.
lib
. 2.
mo, HV, ad omnia quadrata, HV, ſunt vt portio, SMT, ad
parallelogrammum
, HV, rectangula verò ſub, SMT, &
paralle-
logrammo
, HV, diuiduntur in rectangula ſub, SMT, &
ſub, SM
T
, ideſt in omnia quadrata, SMT, &
in rectangula ſub, SMT, &
ſub
quadrilineis, HRSM, MTVN, ideſt bis ſub, SMT, &
ſub
quadrilineo
, MTVN;
namcum, ME, ſit diameter, bifariam di-
uidit
tum ordinatim applicatas in parallelogrammo, HF, tum in
circulo
, vel ellipſi, MBEG, &
ideò exceſſus earundem linearum
hinc
inde relinquuntur æquales, vndein quadrilineis, HRSM, M
TVN
, lineæ in eadem rectitudine ſumptæ ſunt æquales, ideò om-
nia
quadrata portionis, SMT, &
rectangula ſub eadem, & ſub

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