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

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1ritur centrum graurtatis. Quòd ſi figurę nullam conuenien­
tiam
, nullamquè ſimilitudinem inter ſe habuerint; ut in qua
drilateris
, pentagonis, & reliquis figuris, quæ inter ſe ne〈que〉
latera
ne〈que〉 angulos ęquales habeant; & propterea nullam in­
terſe
conuenientiam, & ſimilitudinem habere poſſunt; im­
poſſibile
quidem eſſet in ipſis determinare ſitum centri grauita
tis
; ita vt omnibus quadrilateris, ac omnibus pentagonis quo
modo
cun〈que〉 factis, & ita cęteris figuris deſeruire poſſit.
Cum
exempli
gratia in pentagonis modò in vno, modò in alio ſi­
tu
centrum reperiatur; prout ſunt diuerſę figuræ.
Poſſumus
quidem
in vnaqua〈que〉 figura reperire punctum poſitione,
quod
ſit quidem centrum grauitatis illius determinatæ figu­
ręt
.
vt in fine primilibri oſtendimus. eſſet tamen impoſſibile
in
omnibus proprium certum, ac determinatum ſitum repe­
rire
; vt ſcilicet ſit in tali linea, taliquè modo diuiſa, vtomnib^{9}
pentagonis
, & hexagonis, cæteriſquè huiuſmodi deſeruire
poſſit
.
vt determinatur in triangulis, & vt determinari poteſt
in
quadrilateris; quæ vel ſint parallelogramma, vel duo ſaltem
latera
ſint æquidiſtantia.
cùm in his conuenientia, quàm
triangulis
accidere oſtendimus, reperiatur; quandoquidem
ſunt
triangulorum portiones.
ſimiliter in parallelogrammis fa
cilè
erit oſtendere aliquam inter ſe ſimilitudinem exiſtere. pen­
tagona
verò hexagona, & cæteræ figuræ, quæ angulos æqua­
les
, & æqualia latera habent; iam conſtat ſimilia eſſe inter ſe.
præterea
circuliomnes ſunt ſimiles.
Ellipſes quo〈que〉 inter ſe
aliquam
habent ſimilitudinem, in quibus deſcribitur figura,
planè
inſcripta.
vt perſpicuum eſt in libro Federici Comman
dini
de centro grauitatis ſolidorum.
ac propterea in his, & in
alijs
, quibus inter ſe aliqua ſimililudo reperiri poteſt, centrum
quo〈que〉
grauitatis determinari poterit.
17. quinti.
coro
. 19.
quinti.
22. quinti.
99[Figure 99]

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