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

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THEOREMA V. PROPOS. V.
Sint quicunque circuli ſuper centro, A, nempè, ECD, maior, & ,
VIO
, minor, &
in, ECD, fit ſector quicunque, CAD, & ſimiliter
in
, VIO, quilibet ſector, OAB.
Dico ſectorem, CAD, ad ſectorẽ,
OAB
, eſſe vt omnes circumferentias, CAD, ad omnes circumfe-
rentias
, OAB.
Secent radij, CA, AD, circumferentiam, VIO, in
311[Figure 311] punctis, I, O;
Eſt ergo ſector, CAD, ſi-
milis
ſectori, IAO, &
ideo eſt ad illum,
vt
omnes circumferentiæ ad omnes
11Exantec. circumferentias, ſed &
vt ſector, IAO,
ad
ſectorem, OAB, ita omnes cir-
cumferentiæ
ad omnes circumferen-
tias
, nam ſector, IAO, ad, OAB,
eſt
vt circumferentia, IO, ad, OB,
vt
verò, IO, ab, OB, ſic, deſcripta cir-
cumferentia
, STR, vtcumque, ipſa, ST,
ad
, TR, eſt enim, IO, ad, ST, vt OA, ad,
22Coroll. 2.
3
huius.
AT, ideſt vt, OB, ad, TR, vnde, permu-
tando
, vt, IO, 3d, OB, ſic, ST, ad, SR, &
vt vnum ad vnum, ita
omnia
ad omnia, ideſt vt, IO, ad, OB, ita omnes circumferentiæ,
IAO
, ſectoris ad omnes circumferentias ſectoris, OAB, ſed vt, IO,
ad
, OB, ſic, vt dectũ eſt, ſe habet ſector, IAO, ad, OAB, ergo, IAO,
ad
, OAB, eſt vt omnes circum ferentiæ, IAO, ad omnes circumfe-
rentias
, OAB, ſed &
ſectorem, CAD, ad, IAO, eſſe oſtenſum eſt,
vt
omnes circumferentiæ, CAD, ad omnes circumferentias, IAO,
ergo
ex æquali ſector, CAD, ad ſectorem OAB, eſt vt omnes cir-
cumferentiæ
, CAD, ad omnes circumferentias, OAB.
Et com-
ponendo
figura compoſita ex ſectoribus, CAD, OAB, ad ſectorẽ,
OAB
, erit vt omnes circumferentiæ figuę eiuſdem, ad omnes cir-
cumferentias
ſectoris, OAB, veiuti etiam ſi prædicta figura

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