DelMonte, Guidubaldo, In duos Archimedis aequeponderantium libros Paraphrasis : scholijs illustrata

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1& quadruplam vtriuſ〈que〉 ſimul NX NO. cùm hoc quidem con
ſe〈que〉ns
ſitduæ quintæ ipſius antecedentis.
etenim dupla
triuſ〈que〉
ſimul MN NT quintuplæ earumdem ſimul MN
NT
duæ quintæ exiſtit.
& quadrupla vtriuſ〈que〉 ſimul NX
NO
eſt duæ quintæ decuplæ earumdem NX NO. quadru­
pla
enim decuplæ eſt duæ quintæ.
Quoniam ita〈que〉 ita eſt FG
ad
FK, vt quintupla vtriuſ〈que〉 ſimul MN NT, & decupla
vtriuſ〈que〉
ſimul NX NO ad duplam vtriuſ〈que〉 ſimul MN
NT
, & quadruplam vtriuſ〈que〉 ſimul NX NO, & vt FG ad
KI
, ita quintupla vtriuſ〈que〉 ſimul MN NT, & decupla vtriuſ
〈que〉
ſimul NX NO ad duplam ipſius ON, & ipſam NT:
erit
FG ad ſuas conſe〈que〉ntes ſimul ſumptas FK KI,
eſt
FI, vt quintupla vtriuſ〈que〉 ſimul MN NT, & decupla
vtriuſ〈que〉
ſimul NX NO ad duplam vtriuſ〈que〉 ſimul MN
NT
, & quadruplam vtriuſ〈que〉 ſimul NX NO, & duplam
ipſius
ON, & ipſam NT. ſed in hoc conſe〈que〉nti bis ſumi­
tur
MN, quater NX, ſexies NO, & ter NT. erit igitur vt
FG
æd FI, ita quintupla vtriuſ〈que〉 ſimul MN NT, & decupla
triuſ〈que〉
ſimul NX NO ad compoſitam ex dupla ipſius MN, & qua­
drupla
ipſius NX, & ſextupla ipſius NO, & tripla ipſius NT. &
conuertendo
FI ad FG, vt compoſita ex dupla ipſius
& quadrupla ipſius NX, & ſextupla ipſrus NO, & tripla ip­
ſiús
NT ad quintuplam vtriuſ〈que〉 ſimul MN NT, & decu­
plam
vtriuſ〈que〉 ſimul NX NO. Quoniam ita〈que〉 quatuor rectæ li
neæ
MN NX NO NT ſunt continuè proportionales. factaquè
fuit
MN æqualis ipſi FB, & NO ipſi GB; crit reliqua OM
ipſi
FG æqualis.
& vt TM ad TN ita factum fuit FH,
hoc
eſt tres quintæ ipſius FG, tres ſcilicet quintæ ipſius MO
ad
IR. quare & conuertendo vt NT ad TM, ita quædam aſſum­
pta
linea NI ad tres quintas ipſius FG, hoc eſt ipſius MO. vt autem
compoſita
ex dupla ipſius NM, & quadrupla ipſius NX, & ſextupla ip­
ſius
NO & tripla ipſius NT ad lineam compoſitam ex quintupla vtrius­
〈que〉
ſimul MN NT, & decupla vtriuſ〈que〉 ſimul XN NO, ſic altera quæ
dam
aſſumpta linea IF ad FG, hoc est ad MO, erit ex ſuperioribus RF
duæ quintæ ipſius MN, hoc est ipſius FB. ac propterea reliqua RB
erit
tres quintæ ipſius FB. & obid BR ad.
RF eſt, vt tria
duo
. Quare punctum R centrum est grauitatis portionis ABC. ſit

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