DelMonte, Guidubaldo, In duos Archimedis aequeponderantium libros Paraphrasis : scholijs illustrata

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1eſt punctum 〈que〉 conſtat totius portionis ABC centrum grauitatis eſſe
in linea QE. hoc est inter puncta QE. Quare totius portionis centrum
grauitatis propinquius eſt vertici portionis, quam centrum grauitatis
trianguli planè inſcripti.
ante pri­
mi huius.
4. huius.
2. ſexti­
lemma ta
aliter 13.
primi hui^{9}
2. ſexti.
4. primi
buius.
ex its quæ
ante 2. hu
ius demon
ſtrata ſunt.
ex 8. pri­
mi huius.
*
102[Figure 102] 103[Figure 103]
Rurſus in portione pent agonum rectilineum AKBLC planè inſcri­
batur.
ſitquè totius portionis diameter BD, vtriuſ〈que〉 autem portionis
AKB. BLC diameter ſit vtra〈que〉 KF LG. & quoniam in portione
AKB planè inſcripta est figura rectilinea trilatera AKB, totius por
tionis AKB centrum grauitatis est propinquius vertici K, quam
centrum rectilineæ figuræ AKB. ſit ita〈que〉 portionis AkB centrum
grauitatis punctum H; trianguli verò punctum 1. Rurſus autem ſit por
tionis BLC centrum grauitatis punctum M. trianguli verò BLC pun
ctum N. iunganturquè HM JN; quæ BD ſecent in punctis
QT. erit vti〈que〉 punctum Q vertici B propinquius, quam
T. & quoniam (ſi ducta eſſet FG) lineæ HM IN FG ab æ
quidiſtantibus lineis KF BD LG in eadem diuiduntur pro­
portione.
FG verò, vt oſtenſum eſt, bifariam à linea BD di­
uideretur; ergo & lineæ HM IN bifariam diuiſę proucnient.
æqualis est igitur HQ ipſi QM; & IT ipſi TN. ſed triangulo
AKB æquale est triangulum BLC; portio vero AkB portioni
BLC eſt æqualis.
Demonstratum eſt enim alis in loçis portiones

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