DelMonte, Guidubaldo
,
In duos Archimedis aequeponderantium libros Paraphrasis : scholijs illustrata
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168
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planè inſcriptæ eſſetinter puncta PH; vnde centrum ctiam
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figurę in ABC ſimiliter planè inſcriptę inter KD eueniret;
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eſſetquè centrum grauitatis portionis ABC vertici B propin
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quius, quam centrum figuræ planè inſcriptæ. </
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<
s
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N16862
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abbr
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nullũ
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accideret abſurdum. </
s
>
<
s
id
="
N1686A
">Quare ſi ſuppoſitum fuerit FP ad PH
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lb
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eſſe, vt BK ad KD, tunc (vt eadem demonſtratio rei propo
<
lb
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ſitæ inſeruire poſſet) diuidenda eſſet diameter BD in
<
expan
abbr
="
q;
">〈que〉</
expan
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i
<
lb
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ta vt BQ ad QD ſit, vt FL ad LH. & quoniam maio
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<
arrow.to.target
n
="
marg302
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rem habet proportionem FL ad LH, quàm FP ad PH; ſiqui
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lb
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dem maior eſt FL, quàm FP, & PH maior, quàm LH. Vtverò
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lb
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FL ad LH, ita eſt BQ ad QD; & vt FP ad PH. ita BK ad KD;
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lb
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maiorem quo〈que〉 habebit proportionem BQ ad QD, quàm
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<
arrow.to.target
n
="
marg303
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BK ad KD. & componendo BD ad DQ maiorem, quàm ea
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<
arrow.to.target
n
="
marg304
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dem BD ad Dk. </
s
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<
s
id
="
N1688E
">Quare maior eſt DK, quàm
<
expan
abbr
="
Dq.
">D〈que〉</
expan
>
& ob id
<
lb
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punctum K propinquius erit vertici B, quàm
<
expan
abbr
="
q.
">〈que〉</
expan
>
Deinde
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lb
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planè inſcribenda eſſet figura in portione ABC, ita vt linea
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lb
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inter centrum figuræ inſcriptæ, & centrum portionis minor
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lb
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eſſet, quàm
<
expan
abbr
="
Kq;
">K〈que〉</
expan
>
& reliqua quæ ſequuntur, ita tamen, vt quę
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lb
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facta ſunt in EFG, fiant in ABC; & quæ in ABC,
<
expan
abbr
="
fiãt
">fiant</
expan
>
in EFG.
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lb
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oſtendeturquè centrum figurę inſcriptę in portione EFG pro
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lb
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pinquius eſſe vertici F, quàm centrum grauitatis ipſius portio
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nis EFG. quod quidem fieri non poteſt. </
s
>
<
s
id
="
N168B0
">Ex quibus perlpi
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cuum fit demonſtrationem eſſe vniuerſalem. </
s
>
<
s
id
="
N168B4
">& hanc
<
expan
abbr
="
demõ
">demom</
expan
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ſtrationis partem Archimedem omiſiſſe, vt notam. </
s
>
<
s
id
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N168BC
">Etvt an
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lb
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tea admonuimus, quòd centra grauitatis diametros in eadem
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proportione diuidunt, omnibus parabolis competere intelli
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lb
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gendum eſt. </
s
>
<
s
id
="
N168C4
">ſiquidem omnes ſuntſimiles. </
s
>
<
s
id
="
N168C6
">quo demonſtrato,
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lb
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in ſe〈que〉nti, quo in loco, & in qua diametri parte reperitur
<
expan
abbr
="
cẽ
">cem</
expan
>
<
lb
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trum grauitatis paraboles demonſtrat, quòd vt res perſpicua
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lb
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reddatur; hæc priùs demonſtrabimus. </
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>
</
p
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<
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id
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type
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margin
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<
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id
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<
emph
type
="
italics
"/>
<
expan
abbr
="
lẽma
">lemma</
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>
in
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emph.end
type
="
italics
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4.
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<
emph
type
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huius.
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type
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italics
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type
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28.
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emph
type
="
italics
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quinti.
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addi.
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type
="
italics
"/>
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id
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type
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id
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10.
<
emph
type
="
italics
"/>
quinti.
<
emph.end
type
="
italics
"/>
</
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</
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<
p
id
="
N168FE
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type
="
head
">
<
s
id
="
N16900
">LEMMA. I.</
s
>
</
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>
<
p
id
="
N16902
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type
="
main
">
<
s
id
="
N16904
">Si magnitudo magnitudinis fuerit quadrupla, minorverò
<
lb
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magnitudo alterius magnitudinis ſit tripla, maior magnitu
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do vtrarum què ſimul magnitudinum tripla erit. </
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