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

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410390GEOMETRIÆ eorum notitia in ſuppoſitione eiuſdem byperbolæ qudaraturæ deficiat;
ſi quis tamen adbuc voluerit aliacirca eandem contemplari, metbo-
dum
tenere poterit Lib.
2. & 3. à me proſequutam, mibi verò poſt
byperbolarum
ſpeculationem ad oppoſitas ſectiones, &
coniugatas
Appolonij
opportunè videtur tranſeundum.
THEOREMA XIX. PROPOS. XX.
Sint oppoſitæ ſectiones, AMC, BND, quarum latus tranſuer-
ſum
ſit, NM, communis axis, vel diameter earundem, ad quam
hincinde
productam ordinatim applicẽtur, BD, AC, in fectiones
terminatæ
, abicindentes verſus vertices, NM, axes, vel diame-
tros
, FN, ME, hyperbolarum, BND, AMC, (quas pariter oppo-
ſitas
voco) quæ ſint inter ſe æquales, iunganturque, BA, DC, &

ſit
, O, centrum oppoſitarum ſectionum, BND, AMC:
Quoniam
ergo
, FN, ME, ſunt æquales, erunt etiam æquales, BD, AC, &

ſunt
equidiſtantes, quia ad eandem diametrum, velaxim, FE, ſunt
11Blicitur
ex
29. Pri.
Con
.
ordinatim applicate, ergo, BA, DC, erunt ęquidiſtantes, &
, BC,
parallelogrammum
.
Dico ergo (regula ſumpta altera applica-
tarum
, AC, BD, vt, AC,) omnia quadrata, BC, ad reliquum eo-
rundem
demptis omnibus quadratis oppoſitarum hyperbolarum,
BND
, AMC, eſſe vt rectangulum, NEO, ad rectangulum,

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