Angeli, Stefano degli, Miscellaneum hyperbolicum et parabolicum : in quo praecipue agitur de centris grauitatis hyperbolae, partium eiusdem, atque nonnullorum solidorum, de quibus nunquam geometria locuta est, parabola nouiter quadratur dupliciter, ducuntur infinitarum parabolarum tangentes, assignantur maxima inscriptibilia, minimaque circumscriptibilia infinitis parabolis, conoidibus ac semifusis parabolicis aliaque geometrica noua exponuntur scitu digna

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ESto in ſchemate antecedenti conoides hyper-
bolicum
A E B C, cuius diameter D B, latus
tranſuerſum
G B, &
ſit k, eius centium grauitatis.
Dico B K, ad k D, eſſe vt G B, cum ſubſeſquiter-
tia
B D, ad dimidiam G B, cum quarta parte D B.

Eſto
conoides parabolicum A F B C;
& ſit H, me-
dium
punctum B D, adeo vt ſicuti elicitur ex pro-
poſ
.
42. ſit centrum grauitatis differentiæ conoideo-
rum
:
pariter B I, ſit dupla I D, adeo vt ſit 1, ex
propoſit
.
14. lib. 4. centrum grauitatis conoidis pa-
rabolici
.
Siergo fiat H I, ad I k, vt dimidium G B,
cum
tertia parte B D, ad ſextam partem B D, nem-
pe
ex prop ſit anteced.
reciprocè vt conoides hy-
perbolicum
ad exceſſum conoidis parabolici ſupra
ipſum
, erit k, centrum conoidis hyperbolici.
Tunc
argumente@ur
ſic.
Quoniam B I, quadrupla eſt
I
H, ergo B I, erit ad I k, vt dupla G B, vna cum
ſeſquite
tia B D, ad ſextam partem B D.
Et com-
ponendo
erit B K, ad k I, vt dupla G B, vna

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