Archimedes, Archimedis De iis qvae vehvntvr in aqva libri dvo

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[11.] PROPOSITIO IIII.
[12.] PROPOSITIO V.
[13.] PROPOSITIO VI.
[14.] PROPOSITIO VII.
[15.] POSITIO II.
[16.] COMMENTARIVS.
[17.] PROPOSITIO VIII.
[18.] COMMENTARIVS.
[19.] PROPOSITIO IX.
[20.] COMMENTARIVS.
[21.] ARCHIMEDIS DE IIS QVAE VEHVNTVR IN AQVA LIBER SECVNDVS. CVM COMMENTARIIS FEDERICI COMMANDINI VRBINATIS. PROPOSITIO I.
[22.] PROPOSITIO II.
[23.] COMMENTARIVS.
[24.] PROPOSITIO III.
[25.] PROPOSITIO IIII.
[26.] COMMENTARIVS.
[27.] PROPOSITIO V.
[28.] COMMENTARIVS.
[29.] PROPOSITIO VI.
[30.] COMMENTARIVS.
[31.] LEMMAI.
[32.] LEMMA II.
[33.] LEMMA III.
[34.] LEMMA IIII.
[35.] PROPOSITIO VII.
[36.] PROPOSITIO VIII.
[37.] COMMENTARIVS.
[38.] PROPOSITIO IX.
[39.] COMMENTARIVS.
[40.] PROPOSITIO X.
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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.