Valerio, Luca
,
De centro gravitatis solidorvm libri tres
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PROPOSITIO XXI.
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<
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>Omnis polygoni æquilateri, & æquianguli
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idem eſt centrum grauitatis, & figuræ. </
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>Sit polygonum æquilaterum, & æquiangulum ABC
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DEFG, cuius ſit primo laterum numerus impar, centrum
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autem ſit L. </
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>Dico punctum L, eſse centrum grauitatis
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polygoni ABCDEFG; ſectis enim duobus lateribus
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DE, FG, bifariam in punctis K, H, ducantur ab angulis
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oppoſitis rectæ AH, CK. & rectæ BMG, CNF, CM,
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MF, iungantur. </
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>Quoniam igitur ex decima tertia quar
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ti Elem. quemadmodum in pentagono, ita in omni præ
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dicto polygono imparium multitudine laterum plane col
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ligitur centrum po
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lygoni eſse in qua
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libet recta, quæ ab
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angulo ad medium
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lateris oppoſiti du
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citur, quoniam ab
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omnibus angulis ſic
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ductæ ſecant ſe ſe
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in eadem proportio
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ne æqualitatis, ita
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vt eadem ſit propor
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tio ſegmentorum,
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quæ ad angulos, ad
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ea, quæ ad latera
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illis angulis oppoſita; rectæ AH, CK, ſecabunt ſe ſe in
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puncto L. </
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BAL, æqualis eſt angulo GAL, ſed AB, eſt æqualis
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AG, & AM, communis, erit baſis BM, æqualis baſi </
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