Valerio, Luca, De centro gravitatis solidorvm libri tres

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1ſegmentum eius maiori baſi propinquius ſit ad to­
tum prædictum interiectum ſegmentum, vt tertia
proportionalis minor ad duo latera homologa ba­
ſium oppoſitarum, ad compoſitam ex his tribus
deinceps proportionalibus.
Sit pyramidis fruſtum, cuius baſes oppoſitæ, & parallelæ,
maior triangulum ABC, minor autem triangulum DEF,
axis autem GH. triangulorum autem ABC, DEF, quæ
inter ſe ſimilia eſse neceſse eſt, ſint duo latera homologa
BC, EF: & vt eſt BC, ad EF, ita ſit EF, ad X: vt autem eſt
duplum lateris BC, vna cum latere EF, ad duplum lateris
EF, vna cum la
tere BC, ita ſit
HN, ad NG,
& NO, pars quar
ta ipſius NG, &
HS, pars quar­
ta ipſius GH; ip
ſius autem SO,
ſit VO, ad OS,
vt eſt X, ad com­
poſitam ex tri­
bus BC, EF, X.
Dico punctum V
(quod cadet ne­
ceſsario infra
50[Figure 50]
punctum N, quanquam hoc ad demonſtrationem nihil re­
fert) eſse centrum grauitatis fruſti ABCDEF.
Ducta
enim recta AGL; quoniam GH, eſt axis fruſti ABCD
EF, & punctum G, centrum grauitatis trianguli ABC,
erit punctum L, in medio baſis BC: ſecto igitur etiam la­
tere EF, bifariam in puncto K, iungantur LK, KH: & vt

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