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

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130106 ctionem, & cum ſit FH ad HE, vt FA ad EB, vel vt FD ad EC, vel vt FI ad
IE
, erit diuidendo FE ad EH, vt FE ad EI, quare EH, &
EI ſunt æquales
hoc
eſt productę AB, DC in eodem pun-
95[Figure 95] cto H cum diametro conueniunt, &
ſi ſe-
ctio
fuerit Hyperbola infra 1125. ſec.
conic
.
ab aſymptotis factum;
ideoque ex H duci
poterunt
Hyperbolen contingentes.
Nam pro rectilinea menſali ABCD, & pro ALBCMD coni-ſectionis, vel
circuli
cuius baſis AD, maior ſit baſi BC, oſtendimus AH ad HB eſſe vt AR
ad
RB, ergo &
FH ad HE erit vt FG ad GE, vnde Ellipſis, quæ deſcribitur
cum
tranſuerſo EF, &
applicata RQ, vel LM à rectis HA, HD in 334 huius. R, Q, vel à rectis HL, HM in punctis L, M contingetur; ſed ipſæ HL, HM,
vti
nuper oſtendimus in ijſdem punctis ſectionem quoque contingunt:
qua-
re
huiuſmodi Ellipſis, &
menſalem rectilineam, & conicam ALBCMD 4461. h. ijſdem applicatæ extremis contiget, ac ipſi menſali, erit inſcripta, cum etiam
AD
, BC ex diametri terminis F, E ordinatim ductis æquidiſtantes eandem
Ellipſim
contingant.

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