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

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1
eadem figu
ra.
V
Aequalibus, ſimilibuſquè figuris planis inter ſe
coaptatis, centra quo〈que〉 grauitatum inter ſe coa­
ptati oportet.
SCHOLIVM.
Aequales, ſimiles〈que〉; ſint

figuræ ABC DEF, qua­
rum centra grauitatis ſint
GH; ſi ABC ſuperpona­
tur ipſi DEF, & hoc ſecum
dùm laterum æqualitatem,
hoc eſt ſi latus AB fuerit
æquale lateri DE, tunc
ponatur AB ſuper DE; ſimiliter AC ſuper DF, & BC ſuper
EF; tunc manifeſtum eſt centrum grauitatis G ſuper centro
grauitatis H ad unguem conuenire; ita vt ſint vnum tan tum
punctum.
Plana enim quæ ſe inuicem contingunt, non ef­
ficiunt, niſi vnum tantùm planum.
Solius autem figuræ ex
planis ABC DEF inuicen coaptatis, vnum tantùm erit cen
trum grauitatis, vt nos in noſtro mechanicorum libro ſup­
poſuimus; centra igitur grauitatis inter ſeſe conuenire neceſ­
ſe eſt.
ſi enim centra grauitatis inter ſe non conuenirent, v­
na tantùm figura duo poſſet centra grauitatis habere.
quod
eſſet omnino inconueniens. Dixit autem Archimedes oporte
re has figuras eſſe ſimiles, & æquales, nam figuræ æquales,
ſed non ſimiles, item ſimiles, & non æquales eſſe poſſunt.
qua­
re, vt inter ſeſe coaptari poſſint, & ſimiles, & æquales eſſe ne­
ceſſe eſt.
14[Figure 14]
VI
Inæ qualium autem, ſed ſimilium centra graui­
tatum eſſe ſimiliter poſita.

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