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

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Sit parallelogrammum, FD, & circa latus, FB, vtcunque tam-
quam
circa diametrum (intellige autem ſemper diametrum hic, &

in
ſequentibus, vt eſt nomen commune diametro, &
axi) integri ſic
deſcriptus
ſemicirculus, vel ſemiellipſis, FQB, cuius curua, FQB,
neque
tangat, neque ſecet latus, ZD, oppoſitum lateri, FB, bifa-
riam
autem diuiſa, FB, in, A, &
per, A, ipſi, BD, baſi ducta pa-
rallela
, AP, ſeceturà curua, FQB, vtcunq;
in, Q; erit autem, A
Q
, dimidia ſecundæ axis circuli, vel ellipſis, cuius centrum, A;
du-
catur
inſuperper, Q, ipſi, FB, parallela, HC, quæ tanget circu-
1117.1.Con. lum dictum, vel ellipſim, &
erit, BC, æqualis ipſi, AQ; fiat dein-
de
, vt, DB, ad, BC, ita, BC, ad, BI, &
ſumatur, BR, quæ ſit,
{2/3}, BI, &
, BE, quæ fit, {11/14}, ipſius, CB, & , EV, quæ ſit æqualis
150[Figure 150] ipſi, ER, regula verò ſit, BD.
Dico er-
go
omnia quadrata parallelogrammi, FD,
ad
omnia quadrata figuræ, quæ compre-
henditur
tribus lateribus, FZ, ZD, DB,
&
curua, FQB, eſſe, vt, BD, ad, DV,
proximè
.
Omnia . n. quadrata parallelo-
grammi
, FD, ad rectangula ſub paralle-
logrammo
, FD, &
ſemicirculo, vel ſemi-
22Coroll.1.
26
.lib.2.
ellipſis, FQB, ſunt vt parallelogram-
mum
, FD, ad eundem ſemicirculum, vel
ſemiellipſim
, FQB;
quia verò parallelo-
grammum
, FD, ad parallelogrammum, FC, eſt vt, DB, ad, BC,
&
item parallelogrammum, FC, ad ſemicirculum, vel ſemiellipſim,
335. Lib.2.
Arch
. de
Dim
.Cir.
FQB, eſt proximè vt 14.
ad 11. ideſt vt, CB, ad, BE, ergo ex
æquali
parallelogrammum, FD, ad ſemicirculum, vel ſemiellipſim,
FQB
, erit vt, DB, ad, BE, &
ideò omnia quadrata parallelogram-
mi
, FD, ad rectangula ſub parallelogrammo, FD, &
ſemicirculo,
445.Lib.2. vel ſemiellipſi, FQB, erunt vt, DB, ad, BE,.
i. ſumpta, DB, com-
muni
altitudine erunt, vt quadratum, DB, ad rectangulum ſub, D
B
, BE, quodſerua.
Aduerte nunc, quodrectangula ſub parallelogrammo, FD, &

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