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

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142122GEOMETRIÆ poſitas, ex quibus ſumantur quotcunque partes æquales, AI, IH,
nempè
æquales ipſi, CA, &
, BP, æqualis ipſi, BC, & complean-
tur
parallelogramma, AM, IK, BQ;
ſunt igitur parallelogramma,
CF
, AM, IK, in æqualibus altitudinibus, ac baſibus, &
ideò ſin-
gulorum
omnia quadrata regulis eiſdem baſibus, erunt æqualia, &

119. Huius pari ratione omnia quadrata parallelogrammorum, BQ, CQ, e-
runt
ęqualia, regula, CD, altitudines autem parallelogrammorum,
CF
, AM, IK, ſunt æquales ipſi, AO, &
altitudines parallelogram-
morum
, CE, BQ, ſunt æquales, nempè ipſi, CN, habemus ergo
æquèmultiplices
primę, &
tertiæ . ſ. compoſitum ex altitudinibus pa-
rallelogrammorum
, CF, AM, IK, quod tam multiplex eſt altitu-
82[Figure 82] dinis, AO, quam compoſitum ex omnibus qua-
dratis
, CF, AM, IK, multiplex eſt omnium
quadratorum
parallelogrammi, CF, &
ſic com-
poſitum
ex altitudinibus parallelogrammorum,
CE
, BQ, tam multiplex eſt altitudinis, CN,
ac
compoſitum ex omnibus quadratis parallelo.
grammorum, BQ, CE, multiplex eſt omnium
quadratorum
, CE;
ideſt quam multiplicia ſunt
omnia
quadrata parallelogrammi, HD, omnium quadratorum pa-
rallelogrammi
, AD, tam altitudo parallelogrammi, HD, multi-
plex
eſt altitudinis parallelogrammi, AD, ſiue tam ipſa, CH, mul-
tiplex
eſt ipfius, CA, dum ſunt æquiangula, &
quam omnia qua-
drata
parallelogrammi, PD, multiplicia ſunt omnium quadratorum
parallelogrammi
, BD, tam altitudo parallelogrammi, PD, mul-
tiplex
eſt altitudinis, CN, vel tam, PC, multiplex eſt ipſius, CB:

Si
autem multiplex primæ fuerit æquale multiplici ſecundæ, etiam
multiplex
tertiæ erit æquale multiplici quartæ, ſi maius maius, &
ſi
minus
minus, nam ſi altitudo parallelogrammi, HD, fuerit æqua-
lis
altitudini parallelogrammi, DP, omnia quadrata, HD, erunt
æqualia
omnibus quadratis, DP, nam parallelogramma, HD, D
P
, ſunt in eadem baſi, CD, ſi illa maior, &
hæc maiora, & ſi mi-
22Exautec. nor minora, ergo prima ad ſecundam erit, vt tertia ad quartam,
335. Quinti
Elem
.
nempè vt altitudo parallelogrammi, AD, ad altitudinem paralle-
logrammi
, DB, .
ſ. AO, ad, CN, vel, AC, ad, CB, dum ſunt
æquiangula
, ita erunt omnia quadrata, AD, ad omnia quadrata,
DB
, ſunt ergo, vt altitudines ipſorum parallelogrammorum, vel
vt
latera ęqualiter baſi inclinata, cum nempè parallelogramma ſunt
æquiangula
:
hæc autem etiam verificarentur ſi parallelogramma
eſſent
in æqualibus baſibus, quod oſtendere opus erat.

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