Valerio, Luca
,
De centro gravitatis solidorvm libri tres
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punctum S, priſmatis BCDFGH. </
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<
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>Quoniam igitur
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quadrilateri EG, eſt centrum grauitatis K, cuius duorum
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triangulorum centra grauitatis ſunt P, N; erit vt triangu
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lum FGH, ad triangulum EFH, hoc eſt vt priſma BC
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DFGH, ad priſma ABDEFH, ita NK, ad KP, hoc
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eſt RM, ad MS; cum igitur ſit R, centrum grauitatis
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priſmatis ABDEFH: ſicut & S, priſmatis BCDFGH;
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totius priſmatis ABCDEFGH, centrum grauitatis erit
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M. </
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<
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>Quod ſi priſma baſim habeat quinquelateram; ab
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ſciſso rurſus priſmate vno triangulam baſim habente,
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ſumptiſque axibus priſinatum, quorum alterum habebit
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baſim quadrilateram, eadem demonſtratione propoſitum
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concluderemus, & ſic deinceps in aliis. </
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<
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igitur propoſitum. </
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PROPOSITIO XXXV.
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<
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>Omnis fruſti pyramidis triangulam baſim
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ha bentis centrum grauitatis eſt in axe, primum
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ita diuiſo, vt ſegmentum attingens minorem
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baſim ſit ad reliquum, vt duplum vnius laterum
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maioris baſis vna cum latere homologo mino
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ris, ad duplum prædicti lateris minoris baſis,
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vna cum latere homologo maioris. </
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<
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>Deinde
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à puncto ſectionis abſciſsa quarta parte ſeg
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menti, quod maiorem baſim attingit, & à pun
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cto, in quo ad minorem baſim axis termina
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tur ſumpta item quarta parte totius axis; in
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eo puncto, in quo ſegmentum axis duabus po
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ſterioribus ſectionibus finitum ſic diuiditur, vt </
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