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

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6646GEOMETRIÆ quæ ita inuicem ſuperponantur, vt, BC, FG, ſibi congruant, &
11D. Defin.
10
.
ipſæ ſint ſimiliter poſitæ.
Dico etiam ipſas figuras ad inuicem fore
congruentes
.
Sint oppoſitæ tangentes ductæ pro figura, ABXC,
ipſæ
, AD, XQ, regula, BC, &
pro figura, EFPG, regula, F
22Coroll. 1.
huius
.
G, ipſæ, EM, PN, quarum figurarum, ac oppoſitarum tangen-
tium
ſint quoque incidentes ipſę, DQ, MN, productis verò, BC,
33B. Def. 10. FG, verſus, DQ, MN, illis incidant in punctis, O, R, &
ſuper-
ponatur
figura, ABXC, figuræ, EFPG, ita vt, BC, congruat
ipſi
, FG, &
ſint ſimiliter poſitę: Erunt ergo ipſæ incidentes, DQ,
44D. Defin.
10
.
MN, ad eandem partem figurarum iam ſuperpoſitarum, &
inuicem
parallelæ
, vel congruentes, ſed in noſtro caſu erunt congruentes,
cum
enim vt, BC, ad, FG, ita ſit, DQ, ad, MN, ipſæ verò, B
C
, FG, ſint ęquales, etiam, DQ, MN, ęquales erunt, ſicut etiam,
55A. Def. 10. CO, GR, (quæ ſunt inter ſe vt, DQ, MN,) ergo cum punctus,
B
, poſitus ſit in, F, erit, O, in, R, &
DQ, extenſa ſuper, MN,
33[Figure 33]&
cum etiam, DO, MR, ſint ęquales
punctus
, D, erit in, M, ſic autem oſten-
demus
quoque punctum, Q, cadere in,
N
, &
conſequenter, XQ, cadere ſuper,
PN
, &
, AD, ſuper, EM, ſi ergo figu-
ra
, ABXC, cadens ſuper, EFPG, non
congruit
illi, eſto quod ceciderit, ſi poſ-
ſibile
eſt vt, FVIG, ita vt ambitus ex-
tra
ambitum cadat, ſumpto autem quo-
cunque
puncto, I, qui ſit in ambitu fi-
guræ
, VFPGI, ſed cadens non in am-
bitu
figuræ, EFPG, per ipſum duca-
tur
, TZ, parallela, EM, ſecans, MN,
in
, Z, ambitum figuræ, VPI, in, V, I, &
ambitum figuræ, EF
PG
, in, T, S, erunt autem homologę, VI, TS, &
inter ſe ęqua-
66C. Defin.
10
.
les cum ſint, vt incidentes, DQ, MN, quæ ſunt ęquales, necnon
æquales
reliquæ vſq;
ad incidentes, nempè, SZ, IZ, quod eſt ab-
77A. Defin.
10
.
ſurdum, punctus enim, I, non eſt in S, non ergo cadet ambitus fi-
guræ
, ABXC, ſuperpoſitę, ipſi, EFPG, vt dictum eſt, extra am-
bitum
eiuſdem figurę, EFPG, igitur cadet ſuper illius ambitum, &

ipſę
figurę erunt ſibi inuicem congruentes, quod oſtendendum erat.

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