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

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page |< < (306) of 569 > >|
326306GEOMETRIÆ per, C, ipſi, DF, parallela, CB, & producantur, AR, HO, vſq;
ad, BC, in, P, Q, iunganturque, AC, HC, & à puncto, M,
ducatur
, MX, parallela axi, vel diametro, AP;
quoniam ergo, O
1112.huius. Q, eſt parallela ipſi, MX, &
ipſa ſecat, MC, bifariam in, O, ſe-
cabit
etiam, XC, bifariam in Q;
& quia parabola, ABC, ad pa-
rabolam
, MHFC, eſt vt cubus, BC, ad cubum, CX, vel vt cu-
bus
, PC, ad cubum, CQ, ideò ſemiparabola, APC, ad ſemipa-
rabolam
, HOC, erit vt cubus, PC, ad cubum, CQ, &
eorun-
22@.huius. dem ſubſexquitertia .
i. triangulum, APC, ad triangulum, HOC,
erit
vt cubus, PC, ad cubum, CQ:
quoniam verò triangula æqui-
angula
habent interſerationem compoſitam exratione baſium, &
G
altitudinum
, vel linearum à verticibus earundem ductarum æqua-
33Coroll.1.
19
. 1. 2.
liter baſibus inclinatarum;
ideò triangulum, APC, ad triangu-
lum
, HOC, habebit rationem compoſitam ex ratione baſis, PA,
ad
baſim, OH, vel, AR, illi æqualem, &
ex ratione, PC, ad, C
Q
, quæ vel ſunt altitudines, vellineæ ductæ à communi vertice, C,
cum
æquali inclinatione ad baſes, AP, &
, HO, productam, quia,
218[Figure 218] AP, HQ, ſunt parallelæ, eſt autem vt,
PA
, ad AR, ita quadratum, PC, ad
quadratum
, RF, ergo triangulum, A
PC
, ad triangulum, HOC, habebit
rationem
compoſitam ex ea, quam ha-
bet
quadratum, PC, ad quadratum, R
F
, &
ex ea, quam habet, PC, ad CQ,
quia
verò triangulum, APC, ad trian-
gulum
, HOC, eſt vt cubus, PC, ad
cubum
, CQ, ideò ad illud habet etiam rationem compoſitam ex
ea
, quam habet, PC, ad CQ, &
ex ratione quadrati, PC, ad qua-
dratum
, CQ, ergo iſtæ duæ rationes, ſcilicet quam habet, PC,
ad
, CQ, &
quadratum, PC, ad quadratum, RF, componunt
eandem
rationem, quam iſtæ duæ, ſcilicet ratio, PC, ad, CQ, &

quadrati
, PC, ad quadratum, CQ, eſt autem in his communis
ratio
, quam habet, PC, ad, CQ, ergo reliqua ratio, quam habet
quadratum
, PC, ad quadratum, CQ, erit eadem ei, quam habet
quadratum
idem, PC, ad quadratum, RF, ergo quadratum, C
442.huius. Q, erit æquale quadrato, RF, &
, CQ, erit æqualis ipſi, RF.
Quoniam autem parabola, BAC, ad parabolam, DAF, eſt vt
5512.huius. cubus, BC, ad cubum, DF, .
i. vt cubus, PC, ad cubum, RF,
item
oſtenſum eſt parabolam eandem, BAC, ad parabolam, MH
FC
, eſſe vt cubum, PC, ad cubum, CQ, ideò parabola, DAF,
ad
parabolam, MHFC, erit vt cubus, RF, ad cubum, QC, ſunt
autem
, QC, RF, inter ſe æquales, vtoſtenſum eſt, &
ideò

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