Valerio, Luca, De centro gravitatis solidorum, 1604

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              MG, & angulus ABM, angulo AGM, ſed totus ABC,
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              toti AGF, eſt æqualis; reliquus igitur angulus CBG,
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              reliquo BGF, æqualis erit: ſed circa hos æquales an­
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              gulos recta BM, oſtenſa eſt æqualis rectæ MG, & CB,
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              eſt æqualis GF; baſis igitur CM, baſi GF, & angulus
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              CMB, angulo FMG, æqualis erit; ſed totus BMN,
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              æqualis eſt toti GMN; quia vterque rectus; reliquus
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              igitur CMN, reliquo NMF, æqualis erit, quos circa
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              recta CM, eſt æqualis MF, & MN, communis; baſis
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              igitur CN, baſi NF, & anguli, qui ad N, æquales erunt,
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              atque ideo recti: ſed & qui ad M, ſunt recti, & BM, eſt
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              æqualis GM; parallelæ igitur ſunt BG, CF, & trape­
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              zij CBGF, centrum grauitatis eſt in linea MN: ſed &
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              trianguli ABG, centrum grauitatis eſt in linea AM; to­
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              tius igitur figuræ ABCFG, centrum grauitatis eſt in li­
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              nea AN; hoc eſt in linea AH. </s>
              <s>Rurſus quoniam omnis
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              quadrilateri quatuor anguli ſunt æquales quatuor rectis:
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              & tres anguli ABM, BMN, MNC, ſunt æquales tri­
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              bus angulis FGM, GMN, MNF, reliquus angulus
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              BCF, reliquo CFG, æqualis erit: ſed totus angulus
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              BCD, eſt æqualis toti angulo GFE; reliquus ergo
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              DCF, reliquo CFE, æqualis erit: ſed linea CN, eſt
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              æqualis NF, & anguli, qui ad N, ſunt recti; ſimiliter
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              ergo vt antea, centrum grauitatis trapezij CDEF, erit
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              in linea AH: ſed & totius figuræ ABCFG, eſt in li­
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              nea AH; totius igitur polygoni ABCDEFG, in li­
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              nea AH, eſt centrum grauitatis, quod idem ſimiliter in
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              linea CK, eſse oftenderemus; in communi igitur ſectione
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              puncto L, eſt centrum grauitatis polygoni ABCDEFG.
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              </s>
              <s>Similiter quotcumque plurium laterum numero impa­
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              rium eſset polygonum æquilaterum, & æquiangulum,
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              ſemper deueniendo ab vno triangulo ad quotcumque eius
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              trapezia; propoſitum concluderemus. </s>
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