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

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THEOREMA V. PROPOS. VIII.
SI quilibet cylindricus ſecetur planis parallelis perlatera
ductis
conceptæ in cylindrico figuræ erunt parallelo-
gramma
æquiangula.
Sit quilibet cylindricus, BF, planis ſectus
16[Figure 16] parallelis per latera ductis, ſit autem vnius
in
cylindrico, AF, concepta figuræ paral-
lelogrammum
, BH, alterius autem paral-
lelogramma
, AN, QF.
Dico hæc eſſe
ęquiangula
, quod enim ſint parallelogram-
33ExCor. 6.
huius
.
ma, patet, quia plana ſecantia ducuntur per
latera
, quod verò fint æquiangula patet e-
tiam
, nam in parallelogrammo, AN, la-
tus
, AD, æquidiſtat lateri, BO, &
, AP,
ipſi
, BC, nam ſunt communes fectiones pla-
ni
, ABCR, &
æquidiftantium planorum,
AN
, BH, &
ideo angulus, PAD, æqua-
4410. Vnde-
cimi
Ele.
tur angulo, CBO, ergo parallelogramma, AN, BH, erunt

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