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

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237217LIBER III.
THEOREMA XII. PROPOS. XIII.
Sit circulus, vel ellipſis, ABCD, cuius diametri coniugatæ, A
C
, BD, in quorum terminis, C, D, duæ rectæ lineę ipſum tangen-
tesinter
ſe conueniant in, V.
Dico ergo (ſumpta regula qualibet
diametrorum
, vt, BD,) quod omnia quadrata parallelogrammi, O
V
, ad omnia quadrata trilinei, DCV, duabus tangentibus, DV,
VC
, &
ab ijs incluſa curua, DC, comprehenſi ſunt, vt idem paral-
148[Figure 148] lelogrammum, OV, ad ſui reliquum
dempto
quadrante, OCD, circuli,
vel
ellipſis, ABCD, ſimul cum eo
ſpatio
, quo idem quadrans excedit
duas
tertias parallelogrammi, OV.
Sumatur intra, OC, vtcunque pun
ctum
, E, &
per, E, ducatur ipſi, B
D
, parallela, EF, ſecans curuam, D
C
, in, I.
Omnia ergo quadrata pa-
rallelogrammi
, OV, ad rectangula
ſub
parallelogrammo, OV, &
ſemi-
portione
, OCD, ſunt vt parallelo
11Coroll.1.
26
.lib.2.
grammum, OV, ad eandem ſemiportionem, OCD;
ſed eadem ad
22Coroll.1.
huius
.
omnia quadrata ſemiportionis, OCD, ſunt ſexquialtera, ergo ad
reſiduum
erunt vt parallelogrammum, OV, ad reſiduum ſemipor-
tionis
, OCD, demptis ab ea, {2/3}, parallelogrammi, OV, quarum
idem
parallelogrammum, OV, eſt ſexquialterum;
reſiduum autem
rectangulorum
ſub parallelogrammo, OV, &
ſemiportione, OC
D
, demptis omnibus quadratis ſemiportionis, OCD, ſunt rectan-
33Vide ibid.
dicta
.
gula ſub ſemiportione, OCD, &
trilineo, CDV, nam veluti

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