Valerio, Luca, De centro gravitatis solidorum, 1604

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1
PROPOSITIO IV.
Datis duobus triangulis ſcalenis ſimilibus, &
dato puncto in altero eorum, vnum duntaxat pun­
ctum in reliquo triangulo prædicto puncto ſimi­
liter poſitum poteſt inueniri.
Sint data duo triangula ſcalena ſimilia ABC, DEF,
& in triangulio ABC datum punctum G: ſint autem
hæc triangula ſimiliter poſita.
Dico in triangulo DEF,
vnum duntaxat punctum puncto G ſimiliter poſitum in­
ueniri poſse.
Iunctis enim AG, BG, GC, ponatur
angulus EDH, æqualis angulo BAG, & angulus DEH,
10[Figure 10]
æqualis angulo ABG, & HF iungatur.
Manifeſtum
eſt igitur ex præcedentis Theorematis demonſtratione,
triangula EDH, HDF, FEH, ſimilia eſse triangulis
BAG, GAC, CBG, prout inter ſe reſpondent poſi­
tione, quorum ſex triangulorum binis quibuſque binæ ba­
ſes homologæ reſpondent: AB ED, AC DF, BC

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