Valerio, Luca
,
De centro gravitatis solidorvm libri tres
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vt eſt TV ad VX: & vt ON ad NA, ita VX ad
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applicentur ad ſemidiametrum QT rectæ ZV, XY dia
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metro PR æquidiſtantes. </
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<
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gitudine, vt FB ad BH potentia: & KO ad GN longi
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tudine, vt ZY ad YX potentia. </
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<
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GM, baſi AC parallelæ. </
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ad BI. longitudine, ita GM ad KL potentia: ſed MB
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eſt æqualis ipſi FG, & BL ipſi KH, & BF ipſi GM, &
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BH ipſi KL in parallelogrammis BG, BK; vt igitur
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FG ad KH longitudine, ita erit BH ad BF potentia:
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ſimiliter quotcumque plures eſſent applicatæ idem oſten
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deremus. </
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ita quadratum EB ad BF quadratum, hoc eſt quadra
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tum AD ad quadratum DN, hoc eſt ita quadratum QT,
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hoc eſt quadratum TY, hoc eſt duo quadrata TX, XY,
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ad quadratum TX; erit per conuerſionem rationis, vt FN,
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hoc eſt BD ad GN, ita duo quadrata TX, X
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ſimul,
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hoc eſt quadratum TY, hoc eſt quadratum TP, ad qua
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dratum XY. </
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<
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OK, ita quadratum PT ad quadratum VZ. </
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<
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tendo igitur erit vt OK ad BD, ita quadratum XY ad
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PT quadratum: & ex æquali vt OK ad GN, ita qua
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dratum VZ ad quadratum XY. </
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<
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lineæ BD, OK, GN, inter ſe longitudine, vt in circu
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lo PQSR totidem PT, ZV, XY inter ſe potentia,
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prout inter ſe reſpondent. </
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<
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deremus de quotcumque aliis in circulo, & ſectione para
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bola vt prædictæ applicatis multitudine æqualibus. </
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<
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ellipſe autem, ductis diametris quibuſuis coniugatis, &
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totidem quot in circulo ad vnam ſemidiametrum rectis li
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neis ordinatim applicatis ſecundum puncta ſectionum eiuſ
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dem diametri in eaſdem prædictas rationes, eodemque or
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dine; quoniam ex XXI primi conicorum ſtatim apparet re
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ctarum linearum ita vt diximus in circulo, & ellipſe appli-</
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