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

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560540GEOMETRI Æ cta, TX, ſecante curuam, MH, in, I, regula, OH, oſtendemus
quadratum
ſolidum, PH, viſa dicta figura, ad quadratum ſo-
lidum
, ABHM, eſſe vt, ON, ad compoſitam ex, NR, &
@. RO.
Extendantur . n. HO, VR, verſus, OR, & fiant, OC, RA, ſingulæ
æquales
ipſi, ON, &
, DO, BR, capiantur ſingulæ æquales ipſi, RN
&
iungantur, AC, BD, CB, quas extenſſa indefinitè, TX, ſecet in, F’
P
, E.
Etunt ergo, AO, BO, AD, parallelogramma. Cum verò, CO’
æquetur
, ON, &
DO, ipſi, RN, erit, CD, æqualis, OR . i. ipſi, DB,
vnde
etiam, EP, ipſi, PB, hoc eſt ipſi, RX, &
tota, EX, toti, NX, &
reliqua
, FE, reliquæ, OX, æqualis erit.
Quoniam vero quadratum,
367[Figure 367] OH, ad quadratum, XI, eſt
vt
, ON, ad, NX, hoc eſt, FX,
ad
, XE, hoc eſt quadratum,
FX
, vel quadratum, CO, ad
rectangulum
, FXE, ideo per-
mutando
quadratum, HO,
ad
quadratum, OC, erit vt
quadratum
, IX, ad rectangu-
lum
, FXE, ex quo conclude-
mus
, vt in ſuperioribus rectangulum ſolidum ſub, AO, &
trapezio,
BCOR
, eſſe proportionaliter analogum quadrato ſolido, RMHO.
Similiter oſtendemus quadrata ſolida, AO, OV, eſſe proportionali-
ter
analoga, &
conſequenter prædictis duobus ſolidis eſſe propor-
tionalia
colligemus, vnde permutando quadratum ſolidum, VO,
ad
quadratum ſolidum, MORH, ſeu (conſpecta figura prop.
23. lib.
4
.)
quadratum ſolidum, PH, ad quadratum ſolidum fruſti, ABHM,
erit
vt quadratum ſolidum, AO, ad rectangulum ſolidum ſub, AO,
11Cor. 1. 13.
huius
20.
l
. 2.
&
trapezio, BCOR . i. vt, AO, ad, BCOR . i. vt, CO, ad compoſi-
tam
ex, OD, &
{1/2}. DC, . i. vt, ON, ad compoſitam ex, NR, & {1/2}. R
O
, quod &
c.
PEr hanc ſimiliter ſuppletur prop. 23. poſterior . n. pars, cum
Cor
.
deducetur vt ibi, mutatis nominibus & c. Prop. 24. reſtau-
ratione
non indiget, ſicut etiam p.
25. cum Cor. Prop. 26. oſtende-
tur
etiam vt ibi, mutatis, &
c. ſicut & p. 27. cum Cor. ſimiliter p.
28. cum Cor. p. 29. cum Corollarijs, p. 30. cum Corollarijs, p.
31
.
32. cum Cor. p. 33. 34. cum Cor. 35. cum Cor. p. 36. 37. 38. 39. 40.
cum
Cor.
41. 42. 43. 44. 45. p. 46. autem eſt nobis reſtauranda.

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