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

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346326GEOMETRIÆ
THEOREMA XXX. PROPOS. XXXII.
Sit ergo parallelogrammum, AF, in eadem baſi, DF, & circa
eundem
axim, vel diametrum, BE, cum parabola, DBF, regula
ſit
, DF.
Dico omnia quadrata, AF, ad omnia quadrata figuræ,
CBDF
, demptis omnibus quadratis trilinei, BCF, eſſe, vt, AF,
ad
parabolam, DBF, eadem verò ad omnia quadrata fig.
CBD
233[Figure 233] F, eſſe vt, AF, ad parabo-
lam
, DBF, cum {@/2} {1/4}.
paral-
lelogrammi
, AF;
quoniam
enim
, BE, eſt axis, vel dia-
meter
tum parabolæ, DBF,
tum
parallelogrammi, AF,
ideò
ſi ducatur intra paralle-
logrammum
, AF, vtcunq-
recta
linea parallelaipſi, D
F
, portiones eiuſdem inclu-
ſæ
trilineis, ADB, CFB, erunt inter ſe æquales, &
ideò para-
bola
, DBF, erit figura, qualem poſtulat Prop.
29. Lib. 3. quapro-
pter
omnia quadrata, AF, ad omnia quadrata figuræ, CBDF,
demptis
omnibus quadratis trilinei, BCF, erunt vt, AF, ad para-
bolam
, DBF.
Quoniam verò omnia quadrata, AF, ad omnia quadrata, BF,
ſunt
vt quadratum, DF, ad quadratum, FE, .
i. quadrupla . i. vt
24
.
ad 6. omnia verò quadrata, BF, ſunt ſexcupla omnium qua-
dratorum
trilinei, BCF, .
i. vt 6. ad 1. igitur omnia quadrata, AF,
1130. huius. ad omnia quadrata trilinei, BCF, erunt vt 24.
ad 1. ideſt vt, AF,
ad
ſui ipſius {@/2} {1/4}.
ergo omnia quadrata, AF, ad omnia quadrata

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