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

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1
1. ſexti.
Adhuc (veluti initio quo〈que〉 diximus) ſi fuerit prisma, vt
AB, cuius altera baſis ſit AC. tale verò ſit prisma, vt pl mum
AC planis CH CK &c.
ſit erectum. ſit autem ipſius baſis
AC centrum grauitatis E. Dico ſi prima ſuſpendatur ex pu­

cto E, baſim AC horizonti æquidiſtantem permanere.
vt co
gnoſcamusea, quæ his libris pertractantur, ad praxim poſſe
reduci.
& ne aliquid abſ〈que〉 demonſtratione confirmatum re
linquamus.
hoc quo〈que〉 oſtendemus. hoc pacto.
78[Figure 78]
Primùm quidem exijs, quæ demonſtrata ſunt, rectilineæ
figuræ AC centrum granitatis inueniatur E. eodemquè mo
do figuræ BD centrum grauitatis ſit F. Iungaturquè EF,
quæ bifariam diuidatur in G. Iam patet punctum G cen­
trum eſſe grauitatis priſmatis AB, ex octaua propoſitione Fe­
derici Commandini de centro grauitatis ſolidorum, & ex corol
lario quintæ propoſitionis eiuſdem libri, lineam EF late­
ribus AD CB ęquidiſtantem eſſe.
quoniam autem plana CH
CK ad rectos ſuntangulos plano AC, erit CB eorum
nisſectio eidem plano AC perpendicularis.
acpropterea EF
ipſi CB æquidiſtans plano AC perpendicularis exiſtit.

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