Archimedes, Archimedis De iis qvae vehvntvr in aqva libri dvo

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ARCHIMEDIS
& per conuer-
Figure: /permanent/library/4E7V2WGH/figures/0078-01 not scanned
[Figure 48]
ſionem rationis
ut e b ad e g,
ita f d ad f h.
eſt autem ut a e
ad e b, ita c f
ad f d.
ex æqua
li igitur ut a e
ad e g, ita c f
ad f h.
A_liter_. Aptentur lineæ a b, c d inter ſe ſe, ita ut ad partes
a c angulum faciant;
& ſint a c in uno atque eodem puncto: deinde
iungantur d b, h g, fe.
cum igitur ſit ut a e ad e b, ita c f, hoc eſt
a f ad f d;
æquidiſtabit fe ipſi d b: & ſimiliter h g eidem d b
2. ſexti:æquidiſtabit:
quoniam a h ad h d eſt, ut a g ad g b. ergo f c, h g
30. primiinter ſe ſe æquidiſtant:
& idcirco ut a e ad e g, ita a f; hoc eſt c f ad
fh.
quod demonſtrare oportebat.

LEMMA V.

Sint rurſus duæ portiones ſimiles, contentæ rectis li-
neis, &
rectangulorum conorum ſectionibus, ut in ſupe-
riori figura a b c, cuius diameter b d:
& e f c, cuius
diameter f g:
ducaturque à puncto e linea e h, diame-
tris b d, f g æquidiſtans, quæ ſectionem a b c in _k_ ſe-
cet:
& à puncto c ducatur c h contingens ſectionem
a b c in c conueniensque cumlinea e h in h, quæ ſectio
nem quoque e f c in eodem c puncto continget, ut demon
strabitur.
Dico lineam ductam ab ipſa c h uſque ad ſe-
ctionem e f c, ita ut lineæ e h æquidistet, in eandem pro
portionem diuidi à ſectione a b c;
in quam linea c a à

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