Archimedes, Archimedis De iis qvae vehvntvr in aqva libri dvo

Table of contents

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[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.]
[51. V.]
[52. DEMONSTRATIO SECVNDAE PARTIS.]
[53. COMMENTARIVS.]
[54. DEMONSTRATIO TERTIAE PARTIS.]
[55. COMMENTARIVS.]
[56. DEMONSTRATIO QVARTAE PARTIS.]
[57. DEMONSTRATIO QVINT AE PARTIS.]
[58. FINIS LIBRORVM ARCHIMEDIS DE IIS, QVAE IN AQVA VEHVNTVR.]
[59. FEDERICI COMMANDINI VRBINATIS LIBER DE CENTRO GRAVITATIS SOLIDORV M.]
[60. CVM PRIVILEGIO IN ANNOS X. BONONIAE, Ex Officina Alexandri Benacii. M D LXV.]
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page |< < (19) of 213 > >|
DE IIS QVAE VEH. IN AQVA.
eam proportionem babebit, quam a f ad a e. Sed & eandem habet
a s ad a r.
quare a s ipſi a x eſt æqualis, pars toti, quod fieri non
9. quintipoteſt.
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:
fiatque ut f b, ad
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-
4. ſexti.mut ando o h ad a f, ut h m ad fc.
est autem quadratum h m ad
quadratum g l, ut linea h b ad lineam b g, ex uigeſima primi libri
conicorum:
& quadratum g l ad quadratum fc, ut linea g b ad
ipſam b f:
ſuntq; h b, b g, b f lineæ deinceps proportionales. er-
22. ſexti.
cor. 20. ſe
xti.
go &
quadrata h m, g l, f c, & ipſorum latera proportionalia
erunt.
atque idcirco ut quadratum h m ad quadratum g l, ita li-

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