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

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343323LIBER IV.
THEOREMA XXVIII. PROPOS. XXX.
Sit ſemiparabola, ACB, quam tangat lineæ, AD, & à pun-
cto
, A, ducta, AB, axis, vel diameter, integræ parabolæ, dein-
de
agatur vtcunque, DC, parallela axi, vel diametro, AB, ſecans
curuam
parabolæ in, C, &
occurrens tangenti, AD, in, D, duca-
tur
tandem à puncto, C, ipſi, AD, æquidiſtans, CB, ſecans, AB,
in
, B, regula autem ſit, AD.
Dico ergo omnia quadrata parallelo-
230[Figure 230] grammi, AC, eſſe omnium quadratorum
trilinei
, ADC, ſexcupla:
Omnia enim
quadrata
, AC, ad rectangula ſub, AC,
11Coroll. 1.
26
. l. 2.
&
ſemiparabola, ABC, ſunt vt, AC, ad
ſemiparabolam
, ABC, .
i. ſexquialtera
.
i. vt 6. ad 4. omnia autem quadrata, AC,
2221. huius. ad omnia quadrata ſemiparabolę ABC,
ſunt
dupla .
i. vt 6. ad 3. ergo omnia qua-
33Coroll.
23
. l. 2.
drata, AC, ad reſiduum demptis omni-
bus
quadratis ſemiparabolæ, ABC, à re-
ctangulis
ſub, AC, &
ſemiparabola, ABC, . i. ad rectangula ſub
ſemiparabola
, ABC, &
trilineo, ADC, erunt in ratione ſex-
cuplaideſt
vt 6.
ad 1. ad eadem verò bis ſumpta, vt 6. ad 2. quo-
niam
verò omnia quadrata, AC, ad omnia quadrata ſemipara-
bolæ
, ABC, ſum vt 6.
ad 3. vt dictum eſt, ideò omnia quadrata,
AC
, ad omnia quadrata ſemiparabolæ, ABC, cum rectangulis
bis
ſub ſemiparabola, ABC, &
trilineo, ADC, erunt vt 6. ad 5.
ergo ad reliquum ſcilicet ad omnia quadrata trilinei, ADC, omnia
44D. 23. l. 2. quadrata, AC, erunt vt 6.
ad 1. ideſt erunt eorundem ſexcupla,
quod
oſtendere oportebat.

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