Archimedes, Archimedis De iis qvae vehvntvr in aqva libri dvo

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[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.
[41.] COMMENTARIVS.
[42.] LEMMA I.
[43.] LEMMA II.
[44.] LEMMA III.
[45.] LEMMA IIII.
[46.] LEMMA V.
[47.] LEMMA VI.
[48.] II.
[49.] III.
[50.] IIII.
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74ARCHIMEDIS
LEMMA II.
Sint duæ portionis ſimiles, contentæ rectis lineis, &
rectangulorum conorum ſectionibus;
a b c quidem ma-
ior, cuius diameter b d;
e f c uero minor, cuius diameter
fg:
aptenturq; inter ſeſe, ita ut maior minorem includat
&
ſint earum baſes a c, e c in eadem recta linea, ut idẽ
punctum c ſit utriuſque terminus:
ſumatur deinde in ſe
ctione a b c quodlibet punctum b:
& iungatur h c. Di
co lineam h c ad partem ſui ipſius, quæ inter c, &
ſe-
ctionem e f c interiicitur, eam proportionẽ habere, quam
habet a c ad c e.
_Dvcatvr_ b c, quæ tranſibit per f. quoniam enim portiones
ſimiles ſunt, diametri cú baſibus æquales continent angulos.
quare
æquidiſtant inter ſe ſe b d, f g:
éſtq; b d ad a c, ut f g ad e c:
& permu-
46[Figure 46] tando b d ad
f g, ut a c ad
c e:
hoc eſt
1115. quin-
ti.
ut earum di-
midiæ d c ad
c g.
ergo ex
antecedēti lé
mate ſequi-
tur lineá b c
per punctum
f tranſire.
Ducatur præ
terea à puncto h ad diametrum b d linea h K, æquidiſtans baſi
a c:
& iuncta k c, quæ diametrum f g ſecet in l; per l

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