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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ARCHIMEDIS
q o; uidelicet ut h g ad f p: quod proxime demonſtr atum eſt. At
2. lem:ueroipſi g q æquales ſunt duæ lineæ ſimul ſumptæ qb, hoc eſt h b,
4. lem.&
b g: atque ipſi q a æqualis eſt h f. Sienim ab æqualibus h b,
bq, æqualia fb,

[Figure 32]
ba demantur, re
manentia æqua-
lia erunt.
ergo
dempta h g ex
duabus lineis h
b, h g, relinqui-
tur dupla ipſius
b g;
hoc eſt o h:
& dempta p f ex
f h, reliqua est
b p.
quare o h
19. quintiad h p, eſt ut g q
Sed ut
g q ad q a, ita
hoc
eſt h g ad n c:
& ut o h ad h p,
15. quin-
ti.
ita g b ad c k.
eſt
cnim o h dupla
g b, &
h p item
dupla gf;
hoc eſt
c k.
eandem igitur proportionem habet h g ad n c, qnam g b ad
c k:
& permutando n c ad c k eandem habet, quam b g ad g b.
Sumatur deinde aliud quod uis punctum in ſectum in ſectione,
quod ſit s:
& per s duæ lineæ ducantur: st quidem
æquidistans ipſi db, diametrumque in puncto t ſecans;
s u uero æquidistans ac, & ſecans c e in u. Dico u c