Valerio, Luca
,
De centro gravitatis solidorvm libri tres
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PROPOSITIO IV.
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<
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>Datis duobus triangulis ſcalenis ſimilibus, &
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dato puncto in altero eorum, vnum duntaxat pun
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ctum in reliquo triangulo prædicto puncto ſimi
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liter poſitum poteſt inueniri. </
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<
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>Sint data duo triangula ſcalena ſimilia ABC, DEF,
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& in triangulio ABC datum punctum G: ſint autem
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hæc triangula ſimiliter poſita. </
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<
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>Dico in triangulo DEF,
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vnum duntaxat punctum puncto G ſimiliter poſitum in
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ueniri poſse. </
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>Iunctis enim AG, BG, GC, ponatur
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angulus EDH, æqualis angulo BAG, & angulus DEH,
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æqualis angulo ABG, & HF iungatur. </
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eſt igitur ex præcedentis Theorematis demonſtratione,
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triangula EDH, HDF, FEH, ſimilia eſse triangulis
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BAG, GAC, CBG, prout inter ſe reſpondent poſi
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tione, quorum ſex triangulorum binis quibuſque binæ ba
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ſes homologæ reſpondent: AB ED, AC DF, BC </
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