Ceva, Giovanni, Geometria motus, 1692

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              vocabimus imaginem iuxta geneſim BADI motus ab
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              A in D. </s>
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              Tab.
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              1.
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              Fig.
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              3.</s>
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              Corollarium.
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              Patet, cum motus ſunt æquabiles, geneſes, & imagines figu­
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              ras eße parallelogrammas.
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            <p type="main">
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              DEF. IV.
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              Tab.
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              1.
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              Fig.
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              4.</s>
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            <p type="main">
              <s id="s.000042">SI ſint duæ geneſes, aut imagines ABCD, FEG, ita vt
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              cum geneſes ſint, habeat AB ad FE eandem rationem,
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              quam velocitas in A ad velocitatem in F, & cum imagines
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              velocitatum, quarum tempora AD, FG, velocitas, quam
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              habet mobile inſtanti A ad velocitatem alterius mobilis
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              inſtanti F, ſit vt AB ad FE, & demum ipſis figuris vt imagi­
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              nibus temporum conſideratis habeat velocitas in A ad
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              velocitatem in F rationem eandem, quam AB ad FE, vo­
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              cabuntur tum geneſes illæ, cum imagines inter ſe homo­
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              geneæ. </s>
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              DEF. V.
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              <s id="s.000044">EAm planam Figuram, in qua ductæ quotcunque
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              ęquidiſtantes eò deinceps decreſcunt, quò ad idem
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              extremum propiores fiunt, acuminatam nuncupabimus. </s>
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              DEF. VI. AX. I.
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              <s id="s.000046">INter maximam, & minimam eiuſdem imaginis veloci­
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              tatem cadit quædam media, qua tantùm velocitate, ſi
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              conciperetur motus æquabilis, nihilominùs eodem tem­
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              pore idem ſpatium curreretur, ac iuxta imaginem propoſi­
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              tam: eam ergo mediam velocitatem dicimus propoſitæ
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              imaginis æquatricem. </s>
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