Archimedes, Archimedis De iis qvae vehvntvr in aqva libri dvo

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4919DE IIS QVAE VEH. IN AQVA. eam proportionem babebit, quam a f ad a e. Sed & eandem habet
quare a s ipſi a x eſt æqualis, pars toti, quod fieri non
119. quinti poteſt.
Idem abſurdum ſequetur, ſi ponamus punctum t cadere ul-
tra lineam a c.
neceſſarium igitur est, ut in ipſam a c cadat. quod
demonſtrandum propoſuimus.
LEMMA III.
Sit parabole, cuius diameter a b: atque eam cŏtingen
tes rectæ lineæ a c, b d;
a c quidem in puncto c, b d ue
ro in b:
& per c ductis duabus lineis; quarum alter a c e
diametro æquidiſtet, alter a c f æquidiſtet ipſi b d:
ſuma
tur quod uis punctum g in diametro:
b g, ita b g ad b h:
& per g h ducantur g k l, h e m,
æquidiſtantes b d:
per m uero ducatur m n o ipſi a c
æquidistans, quæ diametrum ſecet in o:
& per n ducta
n p uſque ad diametrum, ipſi b d æquidistet.
Dico h o
ipſius g b duplam eſſe.
V_EL_ igitur linea m n o ſccat diametrum in g, uel in alĳs pun-
ctis:
& ſi quidem ſecat in g, unum at que idem punctum duabus li-
teris go notabitur.
Itaque quoniam f c, p n, h e m ſibiipſis æqui
distant:
& ipſi a c æquidiſtat m n o: fient triangula a f c, o p n,
o h m inter ſe ſimilia.
quare erit o h ad h m, ut a f ad fc: & per-
224. ſexti. mut ando o h ad a f, ut h m ad fc.
quadratum g l, ut linea h b ad lineam b g, ex uigeſima primi libri
conicorum:
ipſam b f:
ſuntq; h b, b g, b f lineæ deinceps proportionales. er-
3322. ſexti.
cor. 20. ſe
xti.
go &
quadrata h m, g l, f c, & ipſorum latera proportionalia
erunt.