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

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3818 IDH: quare rectangulum ADB ad rectangulum EDB, erit vt idem ADB ad
IDH
, ſed ADB ad EDB, eſt vt AD ad DE, vel vt AB ad BC, ergo rectan-
gulum
quoque ADB ad rectangulum IDH, erit vt AB ad BC.
Sequitur er-
go
vt AB ſit tranſuerſum latus, &
BC rectum deſcriptæ Hyperbolæ, vt in
prima
huius oſtenſum eſt.
Quod erat faciendum.
PROBL. V. PROP. VII.
Iam, veleſt CB non maior BA, vel maior. Si non maior, erit quoque ED
non
maior ipſa DA.
Itaque ex educta IDH infra ſubiectum planum dema-
tur
DI, quæ maior ſit ipſa DB, iungatur I B, &
ex A ducatur AO parallela
ad
I B, ſecans IDH in O, &
fiat vt ID ad DF, ita D F ad aliam DH; erit re-
ctangulum
IDH æquale quadrato D F, ſiue rectangulo EDB, ſed rectangu-
lum
EDB eſt non maius rectangulo ADB (nam eſt ED non maior recta DA)
ergo
rectangulum IDH erit non maius rectangulo BDA, ſed rectangulum
IDO
maius eſt rectangulo BDA (nam cum ſit vt ID ad DB, ita OD ad DA,
ſitque
I D maior D B ex conſtructione, erit quoque DO maior DA) quare
IDH
rectangulum minus erit rectangulo IDO, hoc eſt linea DH minor DO;
vnde punctum H eſt inter D, & O, ſiue inter parallelas I B, AO; quare iun-
cta
AH, &
producta ſecabit productam IB ad partes B, L, vt putà in L.

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