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

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214194GEOMETRIÆ. n. nabemus parallelepipedum ſub, AB, & rectangulo, ADC, &
ſub
, AB, &
rectingulo, BCD,. . ſub, BC, & rectangulo ſub, A
B
, CD, cui ſi iunxeris parallelepipedum ſub, BC, &
rectangulo ſub,
BD
, DC, componeour parallelepipedum ſub, BC, &
rectangulo,
129[Figure 129] ADC, quod additum parallele-
pipedo
ſub, AB, &
eodem re-
ctangulo
, ADC, componet pa-
1135. huius. rallelepipedum ſub, AC, &
re-
ctangulo
, ADC, quod quidem
æquale
erit alteri ſummæ prædi-
ctæ
, nempè parallelepipedo ſub,
BC
, &
rectangulo ſub, BD, D
C
, vna cum, {1/3}, cubi, BC, ergo &
eorum tripla æqualia erunt ſci-
licet
parallelepipedum ter ſub, AC, &
rectangulo, ADC, ſeu ter
22Schol. 35.
huius
.
ſub, AD, &
rectangulo, ACD, æquabitur parallelepipedo ter ſub,
BC
, &
rectangulo, BDC, ſeu ter ſub, BD, & rectangulo, BCD,
cum
cubo, BC, additis verò communibus cubis, AC, CD, fiet pa-
3338. huius. rallelepipedum ter ſub, AD, &
rectangulo, ACD, cum cubis, A
C
, CD, ideſt totus cubus, AD, æqualis parallelepipedo ter ſub, B
4438. huius. D, &
rectangulo, BCD, cum cubis, BC, CD, (quæ integrant
cubum
, BD,) &
cum cubo, AC, eſt igitur cubus, AD, æqualis
duobus
cubis, AC, BD.
Poſſibile eſt ergo facere, quod propoſi-
tum
fuit.
EX hoc manifeſtum eſt, ſi, AC, ſit latus dati cubi, & ſit etiam da-
tarecta
linea, vt, AB, minor, AC, poſſibile eſſe inuenire duos
eubos
, vt, AD, DB, ita vt eorum differentia ſit æqualis cubo dato,
AC
, &
laterun cubicorum, AD, DB, ſcilicet, AB, pariter diffe-
rentia
ſit data, eſt.
n. cubus, AC, æqualis dictæ cuborum, AD, DB,
differentiæ
, vt eſtenſum eſt.
Cum verò ſimilia ſolida quæunq; ſint in
tripla
ratione linearum, ſeu later um bomologorum eorumdem, ideò
erunt
, vt cubi ipſarum linearum, ſeu laterum bomologoroum, &
ideò
eandem
rationem, quam babet cubus, AD, ad cubum, DB, babebit
ex
.
gr. Icoſaedrum deſcriptum latere, AD, ad Icoſaedrum deſoriptum
latere
, BD, prædicto bomologo, &
vt cubus, AD, ad cubum, AC,
ita
erit Icoſaedrum, AD, ad Icoſaedrum, AC, nec non colligendo, vt
cubus
, AD, ad cubos, AC, BD, ita erit Icoſaedrum, AD, ad Ico-
ſaedra
, AC, BD, ergo Icoſaedrum, AD, æquabitur Icoſaedris, AC,
BD
, &
ſuperabit Icoſaedrum, BD, Icoſaedro, AC, ergo ſi datum

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