Valerio, Luca
,
De centro gravitatis solidorvm libri tres
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maior baſis, circulus maximus, cuius diameter AD, minor
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autem, cuius diameter BC: & cylindrus AE, cuius baſis
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circulus AD, axis FG; & vt FG ad FA, ita ſit FA, ad
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MN, à qua abſcindatur NO, pars tertia ipſius FG. </
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<
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ABCD
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ad cylindrum AE eſſe vt OM ad MN.
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<
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>Poſita enim G
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H, æquali ipſi
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FG, deſcriba
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tur circa axim
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FG, cylindrus
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L
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K
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, & conus
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HFK. </
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<
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>Quoniam
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igitur duo cylin
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dri AE, LK,
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ſunt eiuſdem al
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titudinis, erunt inter ſe vt baſes, AD, KH. hoc eſt cy
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lindrus AE ad cylindrum LK, duplicatam habebit pro
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portionem diametri AD, ad diametrum KH, hoc eſt eius,
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quæ eſt ſemidiametri AF ad ſemidiametrum GH. hoc eſt
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eam, quæ eſt MN ad GH, ſiue FG. </
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<
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>Sed vt FG ad tertiam
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ſui partem NO, ita eſt cylindrus KL, ad conum KFH;
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ex æquali igitur, erit vt MN ad NO, ita cylindrus AE
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ad conum
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K
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FH, hoc eſt ad reliquum cylindri AE dem
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pta ABCD portione: & per conuerſionem rationis, vt
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NM, ad MO, ita cylindrus AE ad portionem ABCD:
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& conuertendo, vt MO ad MN, ita portio ABCD ad
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cylindrum AE. </
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<
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PROPOSITIO XV.
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<
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>Omnis portio ſphæræ abſciſſa duobus planis
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parallelis neutro per centrum, nec centrum inter
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cipientibus ad cylindrum, cuius baſis æqualis eſt </
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