Valerio, Luca
,
De centro gravitatis solidorvm libri tres
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baſis vnà cum minori, ad duplum minoris, vnà
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cum maiori. </
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<
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>Sit conoidis parabolici ABC, cuius axis BD fruſtum
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AEFC, eius maior baſis circulus, cuius diameter AC, mi
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nor, cuius diameter EF: in eadem parabola per axem, axis
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autẽ
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DG, in quo fruſti AEFC ſit centrum grauitatis H.
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<
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>Dico eſſe vt duplum circuli AC, vnà cum circulo EF, ad
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duplum circuli EF vna cum circulo AC, ita GH, ad HD.
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Iungãtur
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enim re
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ctæ AKB, BLC.
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<
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>Quoniam igitur
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qua ratione oſten
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dimus conoides,
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& triangulum A
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BC, commune
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habere in linea
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BD centrum gra
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uitatis,
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eadẽ
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pror
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ſus remanet de
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monſtratum, fruſti
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AEFC
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centrũ
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grauitatis H, idem eſse quod trapezij AK
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FC; erit duarum parallelarum AG, KL vt dupla ipſius
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AC, vnà cum KL, ad duplam ipſius KL, vnà cum AC
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ita GH ad HD: ſecat enim DG ipſas AC, KL bifa
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riam. </
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<
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>Sed vt AC ad
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K
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L ita eſt circulus AC ad circu
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lum EF, ex demonſtratione antecedentis, hoc eſt vt dupla
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ipſius AC vnà cum KL ad duplam ipſius KL vnà cum
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AC, ita duplum circuli AC vna cum circulo KL ad du
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plum circuli KL vnà cum circulo AC; vt igitur eſt du
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plum circuli AC, vnà cum circulo EF, ad duplum circu
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li EF, vnà cum circulo AC; ita erit GH ad HD.
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<
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