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

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THEOR. XL. PROP. LXXXV.
Etenim, cum ſit DB æqualis EF, & DB
122[Figure 122] bifariam ſecta in G, erit EF in pũcto Ginæ-
qualiter
ſecta, vnde rectangulum BGD ma-
ius
erit rectangulo EGF, cum ſit 1160. h. _MVM_;
ideoque rectangulum BGD ad qua-
dratum
AG, ſiue tranſuerſum BD ad 2221. pri-
mi
conic.
ctum Ellipſis ABCD, maiorem habebit ra-
tionem
quàm rectangulum EGF ad idem
quadratum
AG, ſiue quàm 33ibidem. EF ad rectum Ellipſis AECF:
ſed tranſuerſa
BD
, EF ſunt æqualia, ergo rectũ Ellipſis AB
CD
, minus erit recto AECF:
ſi igitur Ellipſis
huiuſmodi
Ellipſes (cum ſint ęqualiter incli-
natæ
) concipiantur eſſe per eundem verticem ſimul adſcriptæ, ita vt tranſ-
uerſæ
diametri ſimul congruant, ipſa ABCD, cuius rectum minus eſt, inſcri-
pta
erit, ſiue minor AECF, cuius rectum maius eſt, &
ſic minor 442. Co-
roll
. 19. h.
alia, cuius diametri ſegmenta ſint inæqualia:
quare ABCD erit _MINI-_
_MA_
, &
c.

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