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

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5737 mul adſcribi intelligatur, vel SECTIONES SIMVL ADSCRIPTÆ dican-
tur, quando cum fuerint æqualiter inclinatæ earum diametri, &
ordinatim
ductæ inter ſe mutuò congruant.
Nempe cum duę coni-
34[Figure 34] ſectiones ABC, DEF æ-
qualiter inclinatæ, ita di-
ſpoſitę fuerint vt ipſarum
diametri BG, EI ſibi mu-
tuò congruant, &
omnes
vnius applicatę (quarum
vna AG) congruant om-
nibus alterius applicatis,
(quarum vna ſit DI) ipſæ
vocentur ſectiones ſimul
adſcriptæ.
III.
Coni-ſectio, vel circulus, coni-ſectioni, vel circulo inſcribi dicatur, vel
SECTIO SECTIONI INSCRIPTA vocetur, quando cum fuerit altera al-
teri adſcripta, ſit quoque tota intra eandem, nec alicubi ſe mutuò ſecent,
licet in infinitum producantur, quæ in infinitum extendi poſſunt.
Hoc eſt, ſi vt in prima, & ſecunda figura vtriuſque ordinis præcedentis
ſchematis duæ coni-ſectiones ABC, DEF fuerint ſimul adſcriptæ, &
altera
ipſarum vt DEF tota cadat intra aliam ABC, tunc dicatur ſectio DEF inſcri-
pta ſectioni ABC.
IV.
Coni-ſectio, vel circulus, coni-ſectioni, vel circulo circumſcribi intelli-
gatur, vel SECTIO SECTIONI CIRCVMSCRIPTA dicatur, ſi cum fue-
rit altera alteri adſcripta, tota quoque cadat extra eandem, nec alicubi ſe
mutuò ſecent quamuis in infinitum abeant.
Qualis eſt in prædictis figuris ſectio ABC, quæ cum ſit adſcripta ſectioni
DEF tota cadit extra eandem DEF.
V.
Coni-ſectio, vel circulus coni-ſectioni, vel circulo per verticem, vel per
punctum intra, aut extra ſectionem datum adſcribi, vel inſcribi, aut circum-
ſcribi intelligatur, ſiue SECTIO SECTIONI PER VERTICEM, vel PER
DATVM PVNCTVM INTRA, aut EXTRA SECTIONEM ADSCRI-
PTA, vel INSCRIPTA, aut CIRCVMSCRIPTA dicatur, quando cum
fuerit altera alteri adſcripta, vel inſcripta, aut circumſcripta, vnius diameter
per datum punctum educta ſit quoque diameter alterius;
vt videre eſt in
præcedentibus figuris.
VI.
HYPERBOLE, & ELLIPSES, SIMILES inter ſe dicantur, quando cum
fuerint ęqualiter inclinatę ipſarum latera ſint proportionalia, hoc eſt vt tran-
ſuerſum vnius ad rectum, ita ſit tranſuerſum ad rectum alterius eiuſdem no-
minis.
VII.
CONGRVENTES CONI-SECTIONES dicantur illæ, quæ cum

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