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

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556536GEOMETRIE ptam ab, HM, prædictæ homologa, habet duplicatam rationem
eius
, quam, EF, habet ad, HM, ergo vt quadratum, EF, ad qua-
dratum
, HM, ita eſt figura, EF, ad ſibi ſimilem figuram deſcriptã
ab
, HM, &
permutando vt quadratum, EF, ad figuram quamcuq;
364[Figure 364] aliam deſcriptam ab, EF, ita erit quadratum,
HM
, ad figuram prędictæ ſimilem deſcriptam
ab
, HM, prædictæ homologa, ergo quadratũ
ſolidum
figuræ, DEF, &
ſolidum ſimilare quo-
dcumq
;
genitum ex figura, DEF, luxta comu
nem
regulam, EF, ſunt ſolida proportionaliter
analoga
ſecundum communem regulã, EF, ergo erunt inter ſe vt fi-
113. huius. guræ planæ ab eodem latere, vt ab, EF, deſcriptę.
Eodẽ modo oſtẽ-
demus
quadratum ſolidũ, ABC, &
ſolidũ aliud quodcumq; ſimilare
genitum
ex figura, ABC, iuxta cõmunẽ regulam, BC, eſſe inter ſe, vt
figuræ
à, BC, deſcriptæ, ſunt autem duo quadrata, BC, EF, &
duæ
aliæ
quæcumq;
ſimiles figuræ planæ deſcriptæ ab homologis, BC,
EF
, proportionales, ergo &
dicta ſolida proportionalia erunt, nẽpè
vt
quadratũ, BC, ad figuram, BC, ſic erat quadratum ſolidũ, ABC,
ad
ſolidum ſimilare genitũ ex, ABC, ſed vt quadratũ, BC, ad figurã,
BC
, ita eſt qua dratum, EF, ad figuram, EF, prædictæ ſimilem, &
ita
etiam
quadratum ſolidum, DEF, ad ſolidum prædicto ſimilare ge-
nitum
ex, DEF, ergo quadratum ſolidum, ABC, ad ſolidum ſimi-
lare
, ABC, eſt vt quadratum ſolidum, DEF, ad ſolidum præ dicto
ſimilare
genitũ ex, DEF, &
permutando quad. ſolidũ, ABC, ad qua-
dratũ
ſolidũ, DEF, erit vt ſolidũ quodcũq;
ſimilare genitũ ex, ABC,
ad
ſibi ſimilare gen ex, DEF, luxta dictas regulas, quod oſtendere
opus
erat.

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