Valerio, Luca
,
De centro gravitatis solidorvm libri tres
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>POSTVLATA.</
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>I.</
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>Omnis figuræ grauis vnum eſſe centrum gra
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uitatis. </
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>II.</
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>Omnium figurarum ſibi mutuo congruentium
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centra grauitatis mutuo ſibi congruere. </
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>III.</
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>Omnis figuræ, cuius termini omnis cauitas
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eſt interior, intra terminum eſſe centrum graui
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tatis. </
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>IIII.</
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>Similium triangulorum ſimiliter poſita eſse
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centra grauitatis. </
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>In triangulis autem ſimilibus
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ſimiliter poſita puncta eſſe dicuntur, à quibus re
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ctæ ad angulos æquales ductæ cum lateribus ho
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mologis angulos æquales faciunt. </
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>V.</
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>Æqualia grauia ab æqualibus longitudinibus
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ſecundum centrum grauitatis ſuſpenſa æquipon
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derare. </
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>VI.</
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>A quibus longitudinibus duo grauia æquipon
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derant, ab ijſdem alia duo quælibet illis æqualia
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æquiponderare. </
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