Casati, Paolo
,
Terra machinis mota : dissertationes geometricae, mechanicae physicae hydrostaticae
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conſiſtas angulos CAE, CBF obſeruaturus.
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Quibus angulis obſer
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uatis intellige rectam
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BF occurrere Tangen
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ti AE in G. </
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>In triangu
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lo itaque ABG angu
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lus AGB eſt notus, vt
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pote differentia duo
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rum obſeruatorum C
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BG, CAG: angulus A
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eſt obſeruatus, & data
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eſt altitudo BA: ergo
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inueniri poteſt quantitas rectæ BG. </
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>Iam du
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cantur rectæ CF, CE, & ſunt duo triangula
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AEC, BFC rectangula, in quibus duo an
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guli EAC, ECA ſimul ſunt æquales duo
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bus FBC, FCB: Atqui angulus ECA eſt æ
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qualis duobus ECF, FCB; ergo tres ECF,
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FCB, CAE ſunt æquales duobus FBC, FCB;
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& dempto communi FCB, remanet FBC
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æqualis duobus ECF, EAC. </
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differentia nota duorum obſeruatorum CAE,
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CBF. </
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>Ducatur demùm recta CG. </
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>Et quo
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niam GF, GE ſunt tangentes circulum ab
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eodem puncto exeuntes, inter ſe æquales
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ſunt, ſicut & CF, CE ex centro ductæ; CG
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verò eſt vtrique triangulo FCG, ECG com
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munis; ergo angulus ECF notus diuiditur à </
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