Valerio, Luca
,
De centro gravitatis solidorum
,
1604
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tur in parabola ABC rectis ad diametrum ordinatim ap
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plicatis eſt vt BM ad BD longitudine, ita MH ad AD
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potentia: hoc eſt, ita circulus, cuius diameter HMN, ad
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circulum, cuius diameter ADC, hoc eſt ita cylindrus HL,
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ad cylindrum AF propter æqualitatem altitudinum: ſed
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vt BM ad BD, ita eſt GM ad AD, propter ſimilitudinem
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triangulorum, hoc eſt ita
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parallelogrãmum
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GK ad AF, pa
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rallelogrammum; ergo vt parallelogrammum GK ad paral
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lelogrãmum
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AF, ita eſt cylindrus HL ad cylindrum AF.
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>Similiter oſtenderemus reliqua parallelogramma, quæ ſunt
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circa
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triãgulum
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ABC eſse cum reliquis cylindris, qui ſunt
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circa conoides ABC bina ſumpta prout inter ſe reſpon
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dent in eadem proportione; ſemper igitur componendo, &
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ex æquali erit vt tota figura triangulo ABC circumſcripta
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ad parallelogrammum AF, ita figura conoidi circumſcri
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pta ad AF cylindrum: ſed vt parallelogrammum AF, ad
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parallelogrammum AE, ita eſt cylindrus AF ad cylindrum
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AE, propter æqualitatem omnifariam ſumptarum altitu
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dinum; ex æquali igitur erit vt figura triangulo ABC cir
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cumſcripta ad parallelogrammum AE, ita figura conoidi </
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