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

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THEOREMA XI. PROPOS. XI.
SI ab initio ſpiralis in prima reuolutione ortæ educan-
tur
rectæ lineæ vtcumque ad ipſam ſpiralem terminã-
tes
, ſpatia ſub portionibus ſpiralis abſciſsis per eductas
verſus
initium, erunt vt cubi earundem eductarum.
Sit ſpiralis in prima reuolutione orta, ACDB, ipſa, AB, reuo-
luta
, &
ſpiralis initium, A, à quo ad ipſam ſpiralem terminantes
ſint
eductæ vtcumq;
AC, AD. Dico ſpatium ſub portione ſpira-
lis
, AXC, &
educta, AC, ad ſpatium ſub portione ſpiralis, AXCD,
&
educta, AD, eſſe vt cubum, AC, ad cubum, AD. Centro igitur,
A
, interuallis, C, D, ſint deſcripti circuli, CMVN, DGE, &

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