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

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Sit portio ABC, qualis dicta est. ipſius verò diameter ſit BD. cen­
trum autem grauitatis ſit punctum H. oſtendendum eſt BH ipſius HD
ſeſquialteram eſſe.
Planè inſcribatur in portione ABC triangulum ABC.
cuius centrum grauitatis ſit punctum E. biſariamquè diuidatur vtra­
què AB BC in punctis FG. & ipſi BD æquidiſtantes ducantur Fk
GL. erunt vti〈que〉 FK GL diametri portionum AkB BLC. ſit ita­
〈que〉 portionis AkB centrum grauitatis M; portionis verò BLC pun­
ctum N. connectantur〈que〉 FG MN kL, quæ diametrum BD ſe­

cent in punctis OQS. Quoniam igitur puncta MN in eadem
proportione diuidunt KF LG, erit KM ad MF, vt LN
NG. & componendo KF ad FM, vt LG ad GN. & per­
mutando KF ad LG, vt FM ad GN. ſuntquè KF LG
æquales; erit FM ipſi GN ęqualis; & reliqua Mk
LN æqualis.
& quoniam FM GN, & Mk NL ęqui­
diſtantes, erunt FG MN KL inter ſe ęquales, & æquidiſtan­
tes
. & eſt BD æquidiſtans KF, erit igitur SQ ipſi KM æ­
qualis.
quia verò KF BD LG ſunt æquidiſtantes, erit MQ
QN, vt FO ad OG. Cùm autem ſit BF ad FA, vt BG ad GC,

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