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

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9979LIBERI. ZX. Dico hanc tangere dicta ſolida, ſi enim non tangit ſecet, ve-
luti
, D2N, in puncto, N, igitur punctus.
n. erit extra planum figu-
ræper
axem, nam ipſa, D2N, eſt parallela ipſi, ZX, quæ eſt ad
rectos
angulos figuræ per axem tranſeunti, &
ideò etiam, D2N,
118. Vndec.
Elem
.
eſt illi ad rectos angulos, occurrit autem illi in puncto, 2, ergo non
occurret
illi in alio puncto, ergo, N, eſt extra planum figuræ per a-
xem
, ducatur per, N, planum æquidiſtans plano, PXRZ, circuli,
2234. huius. quod producat circulum, BNFC, &
ſit, BF, communisſectio ip-
ſius
circuli, &
figuræ per axem, quæ erit ipſius circuli diameter, & ,
33Corol. 34
huius
.
N, non erit aliquis punctorum, BF, ergo ſi ab, N, duxerimus ipſi,
ZX
, parallelam, vt, NC, cum etiam, BF, ſit parallela ipſi, PR,
continebunt
angulos æquales, ſed, ZX, ſecat perpendiculariter, P
4410. Vnd.
Elem
.
R, ergo, NC, ſecabit perpendiculariter, BF, ducta non ab extre-
mitate
diametri, ergo intra circulum, BCFN, erit, &
bifariam ſe-
cabitur
ab ipſa, BF, ergo non tranſibit per circuitum figuræ per a-
xem
ductæ, &
per ipſum tranſit, D2N, ergo, NC, N2D, ſunt
duæ
rectæ lineæ eidem, ZX, parallelę, ergo etiam inter ſe erunt pa-
rallelæ
, quod eſt abſurdum, cum tranſeant per idem punctum, N,
ergo
ducta per punctum ambitus figuræ per axem parallela ipſi, ZX,
tanget
dicta ſolida:
Sit nobis nunc punctus, N, pro puncto vtcung;
in ſuperficie ambiente ſumpto extra circuitum figuræ per axem, à
quo
ducta ipſi, ZX, parallela, occurrat producta ſuperficiei ambienti
in
puncto, C, oſtendemus ergo eodem modo ſupra adhibito (poſt-
quam
duxerimus per, N, planum circulo, PXRZ, æquidiſtans,
quod
in ſolido producat circulum, BNFC,) ipſam, NC, intra cir-
culum
, BNFC, cadere, &
bifariam diuidi à recta, BF, ſiue à figu@a
per
axem ducta (nam eſt, NC, perpendicularis ipſi, BF,) quod o-
ſtendere
opus erat.

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