Valerio, Luca, De centro gravitatis solidorvm libri tres
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              diametro ſectionis parallelæ inter ſe ſunt longi­
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              tudine, vt inter applicatas & contactum, vel ver­
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              ticem interiectæ inter ſe potentia. </s>
              <s>Productis au­
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              tem dictis applicatis, erunt inter ſectionem & ba­
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              ſim interiectæ inter ſe longitudine, vt in circulo,
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              vel ellipſe ad diametrum ordinatim applicatæ, ſe­
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              cantesque illam in eaſdem rationes, in quas aliæ
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              prædictæ applicatæ ſecant baſim parabolæ, inter
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              ſe potentia. </s>
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              <s>Sit ſectio parabola ABC, cuius vertex B, diameter
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              BD: & recta quadam BE ſectionem contingente in pun­
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              cto B, ſint quotcumque rectæ lineæ ex ſectione ordinatim
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              ad BE contingentem applicatæ diametro BD ſectionis
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              parallelæ FG, KH, quibus productis ſint ad baſim ſe­
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              ctionis applicatæ GN, KO. </s>
              <s>Et expoſito primum circu­
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              lo, PQRS, cuius diametri ad rectos inter ſe angulos ſint
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              QS, PR; ſecta autem QT in punctis V, X, in eaſ­
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              dem rationes, in quas ſecta eſt AD in punctis N, O,
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              ſumpto ordine à punctis D, T, vt ſit DO ad ON, </s>
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