Valerio, Luca
,
De centro gravitatis solidorvm libri tres
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lam contingat, altera in altero ſecet diametro æ
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quidiſtans. </
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>Sint data duo puncta. </
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>A, C, in duabus rectis lincis da
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tum angulum ABC continentibus, ſit autem aſſignatum
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punctum C. </
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>Dico per puncta A, C, parabolam tranſi
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re, ita vt ipſam linea AC contingat in C puncto, altera
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autem AB ſecet in puncto A, diametro parabolæ æqui
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diſtans. </
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>Completo enim parallelogrammo BD, ad re
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ctam CD applicetur rectangulum æquale quadrato AD,
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faciens latitudinem E. </
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<
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>Quoniam igitur in plano BD
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parabola inueniri poteſt, cu
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ius ſit vertex C, diameter
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CD, ita vt quædam ex ſe
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ctione ad diametrum CD
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applicata in dato angulo A
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BC, ideſt ADC, qualis
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eſt recta AD, poſſit rectan
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gulum ex CD, & E, ex
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primo conicorum elemen.
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<
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AC; aſſignatum eſt autem punctum C; per puncta igi
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tur A, C parabola AC tranſibit, cuius vertex eſt aſſi
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gnatum punctum C. </
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<
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>Et quoniam quæ ex vertice recta
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CB eſt applicatæ DA parallela, ſectionem AC in pun
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cto C continget: eſt autem AB diametro CD æquidi
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diſtans, ac proinde parabolam ſecabit in puncto A. </
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nifeſtum eſt igitur propoſitum, </
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PROPOSITIO IV.
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<
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>Si recta linea parabolam contingat, omnes re
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ctælineæ ex ſectione ad contingentem applicatæ </
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