Valerio, Luca
,
De centro gravitatis solidorum
,
1604
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PROPOSITIO XXXIII.
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<
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>Omnis priſmatis triangulam baſim habentis
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centrum grauitatis eſt in medio axis. </
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>Sit priſma ABCDEF, cuius baſes oppoſitæ trian
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gula ABC, DEF, axis autem GH, ſectus ſit bifariam
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in puncto K. </
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<
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>Dico punctum K, eſse priſinatis ABCD
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EF, centrum grauitatis. </
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<
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>Ducantur enim rectæ FGO,
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CHP, PO. </
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<
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>Quoniam igitur GH, eſt axis priſmatis
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ABCDEF, erit punctum G, centrum grauitatis trian
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guli DEF: ſicut & H, trian
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guli ABC; vtraque igitur
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dupla eſt AG, ipſius GO,
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& CH, ipſius PH, ſectæ
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que erunt AB, DE, bifa
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riam in punctis P, O: pa
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rallela igitur, & æqualis eſt
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OP, ipſi DA, iamque ipſi
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FC. quæ igitur illas con
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iungunt CP, FO, æqua
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les ſunt, & parallelæ, & pa
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rallelogrammum FP.
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<
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>Nunc ſecta OP, bifariam in
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puncto N, iungantur GN,
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NF, AF, FH, FB, & fa
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cta FL, tripla ipſius LH,
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à puncto L, per punctum K, ducatur recta LKMR.
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<
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>Quoniam igitur eſt vt FG, ad GO, ita CH, ad HP,
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& parallelogrammum eſt FCPO; parallelogramma
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etiam erunt CG, GP, angulus igitur FGH, æqualis
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erit angulo NGO, quos circa æquales angulos latera </
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