Valerio, Luca
,
De centro gravitatis solidorvm libri tres
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quadrupla igitur BC ipſius DK: cum igitur BC ſit
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dupla ipſius KH, erit DK dimidia eiuſdem KH, & ſecta
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bifariam KH in puncto D: ſed recta AG ſecabat eandem
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KH bi fariam; per punctum igitur D tranſibit AG. </
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>Quo
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niam igitur parabola ADC, cuius vertex D, ſeſquiter
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tia eſt per Archimedem trianguli ADB, cuius duplum
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eſt triangulum ABG, ſicut & huius triangulum ABC;
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triangulum ABC quadruplum erit trianguli ADB: qua
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lium igitur partium æqualium eſt triangulum ABC duo
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decim, talium erit triangulum ADB trium, & parabola
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ADB, cuius ver
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tex D quatuor: du
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plum igitur erit tri
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angulum ABC
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mixtum parabolæ
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ADB, cuius ver
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tex D, & cen
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trum grauitatis M:
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ſed trianguli ABC
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rectilinei eſt cen
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trum grauitatis N,
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& F
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ABC
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mixti; dupla igitur
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erit MN ipſius N
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F, & MD ipſius
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OF, & DN ipſius NO, propter ſimilitudinem triangulo
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rum: ſed & tota AN dupla eſt totius NG, ob centrum
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grauitatis N rectilinei trianguli ABC; reliqua igitur AD
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dupla eſt reliquæ GO. cum igitur AG ſit dupla ipſius
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AD, quadrupla erit AG ipſiuſque GO. quare & quadru
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pla AE ipſius FE ob parallelas: tripla igitur AF ipſius FE.
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>Rurſus quoniam ex Archimede ſeſquialtera eſt DM ipſius
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MH, erit tota DH ad DM vt quinque ad tria, hoc eſt
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vt decem ad ſex: ſed MD erat dupla ipſius OF; tota igi-</
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