Viviani, Vincenzo, De maximis et minimis, geometrica divinatio : in qvintvm Conicorvm Apollonii Pergaei

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161137 DA, & in triangulo LAI rectangulum LIR æquale quadrato IA. Quod
ſerua
.
Iam ſi ſectio primæ figure ABC fuerit Parabole, cum AE ſit ei contingens
erit
EB æqualis BF, ergo rectangulum EDF cum quadrato FB 1120. pr.
conic
.
quadrato BD, quare
127[Figure 127] ſolum rectangulũ EDF,
ſiue
quadratum DA mi-
nus
erit quadrato DB,
ſiue
linea D A minor
DB
.
Siverò eadem figura
Hyperbolen
reprefen-
tet
, reperto eius centro
Q
, erit rectangulum
FQE
ęquale 2237. pri-
mi
conic.
QB, ergo FQ ad QB, vt
QB
ad QE, vel vt 33Coroll.
12
. h.
ad BE, ſed FQ maior eſt QB, ergo FB erit maior BE, ſiue pluſquam dimi-
dium
ipſa FE, diuiſa ergo FE bifariam in V, erit FV minor FB, eritque re-
ctangulum
EDF cum quadrato FV æquale quadrato DV, igitur ſolum re-
ctangulum
EDF, hoc eſt quadratum DA minus quadrato DV, ſeu linea DA
minor
DV, &
minor ipſa DB.

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