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

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225205LIBER III. ad quadratum, IM, ergo per conuerſionem rationis rectangulum,
11Ex 40. l. 1.
& ex eius
Scholio.
138[Figure 138] HEB, .
i. quadratum, BE, ad qua-
dratum, ME, (quod eſt exceſſus re
ctanguli, HEB, ſub rectangulum, H
225. 2. elem. MB,) erit vt quadratum, RM, ad ſui
reliquum, dempto quadrato, MI, ſed
vt quadratum, BE, ad quadratum, E
M, ita quadratum, BC, ideſt quadra-
tum, MR, ad quadratum, MN, quia
334. 6. elem. triangula, BEC, MEN, ſunt æquian-
gula;
ergo quadratum, BC, ideſt qua-
dratum, MR, ad quadratum, MN,
erit vt idem quadratum, MR, ad ſui
reliquum, dempto quadrato, MI, &

eorum quadrupla .
ſ. quadratum, SN, æquabitur reliquo quadrati,
VR, dempto quadrato, TI, quod erat oſtendendum.
COROLLARIV M.
_Q_VONIAM autem punctum, M, ſumptum eſt vtcumque hinc
patet, quod omnia quadrata trianguli, AEC, (regula, DF,)
æquantur reliquo omnium quadratorum parallelogrammi, AF, dem-
ptis omnibus quadratis ſemicirculi, vel ſemiellipſis, DBF, &
duabus
vtcunq;
ductis ipſis, DF, parallelis, vt, XG, VR, patet, quod om-
nia quadra@a trapezij, γSN℟, æquabuntur reſiduo omnium quadra-
torumpar allelogrammi, XR, demptis omnibus quadratis portionis ſe-
micirculi, vel ſemiellipſis inter, ZL, TI, concluſæ:
Quia verò oſten-
ſa eſtratio omnium quadratorum cuiuſuis parallelogrammorum in alti-
tudine eadem cum portionibus, baſi autem æquali ſecundæ diametre,
44_24, & 28._
_lib. 2._
ad omnia quadrata trapeziorum, vel triangulorum in ijſdem exiſten-
tium, hine manifeſta eſt ratio eorundem ad dictareſidua, &
conſequen-
ter ad omnia quadrata portionum ſemicirculi, vel ſemiellipſis, DBF,
dictis parallelis interpoſitarum, vt ex.
gr. nota erit ratio, quam babent
omnia quadrata parallelogrammi, XR, ad omnia quadrata portionis,
ZTIL, &
ſic in reliquis. Quia verò omnia quadrata trianguli, AE
55_F. Cor. 22_
_lib. 2._
C, ad omnia quadrata trianguli, SEN, ſunt in tripla ratione ipſius,
BE, ad, EM, ideò etiam patebit, quod omnia quadrata parallelogram-
mi, AF, demptis omnibus quadratis ſemicirculi, vel ſemiellipſis, D
BF, ad omnia quadrata parallelogrammi, VF, demptis omnibus qua-
dratis fruſti, TDFR, ſint in tripla ratione ipſius, BE, ad, EM, ideſt
vt cubus, BE, ad cubum, EM.

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