Valerio, Luca
,
De centro gravitatis solidorvm libri tres
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lo KLM: ſed triangulum FGH, eſt ſimile triangulo
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ABC, & triangulum KLM, ſimile eidem triangulo
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ABC;
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triangulũ
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ergo FGH, ſimile erit triangulo KLM:
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ſed & æquale propter æqualitatem laterum homologo
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rum. </
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>Similiter oſtenderemus reliquum ſolidum LKM
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GFH continentia triangula bina oppoſita æqualia
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inter ſe, & ſimilia, & parallela; octaedrum eſt igitur
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LKMGFH. </
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>Dico iam punctum P, quod eſt cen
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trum pyramidis ABCD, eſse centrum octaedri L
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K
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MGFH. </
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>Quoniam enim DP, ponitur tripla ipſius PE,
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& DO, eſt æqualis
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OE (ſiquidem planum
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trianguli KLM, plano
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triãguli
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ABC, paralle
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lum ſecat proportione
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oẽs
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rectas lineas, quæ
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ex puncto D, in ſubli
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mi pertinent ad ſubie
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ctum planum trianguli
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ABC) erit OP, ipſi
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PE, æqualis. </
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>Et quo
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niam BH eſt dupla
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ipſius QH, quarum
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BE eſt dupla ipſius
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EH, ſiquidem E eſt centrum trianguli ABC; erit reli
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qua EH reliquæ EQ dupla: & quia eſt vt LD ad DB,
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ita LN ad BH, propter ſimilitudinem triangulorum, &
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eſt LD, dimidia ipſius BD, erit & LN, dimidia ipſius
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BH: ſed QH eſt dimidia ipſius BH; æqualis igitur LN
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ipſi QH. </
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>Iam igitur quia eſt vt BE ad EH, ita
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LO ad ON: ſed BE, eſt dupla ipſius EH; dupla igi
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tur LO, erit ipſius ON: ſed & QH erat dupla ipſius
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QE; vt igitur LN ad NO, ita erit HQ ad QE: & </
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