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

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1portio AFB trianguli AFB eſt ſeſquitertia,
portio BLC trianguli BLC, eritportio AFB ad triangulum
AFB, vt portio CLB ad triangulum CLB, & permutando
portio AFB ad portionem CLB, vt triangulum AFB
ipſum CLB triangula verò ſunt æqualia; ergo portiones AFB
CLB inter ſe ſunt æquales.
Eademquè ratione triangulum AFB
octuplum eſt trianguli AIF, & triangulum CLB octuplum
ipſius CML. vnde triangula AIF CML ſunt æqualia.
et ea­
rum quo〈que〉 portiones AIF CML ſunt æquales, ſiquidem
ſunt triangulorum ſeſquitertiæ.
Et hoc modo reliqua trian­
gula FKB LNB, & portiones FKB LNB oſtendentur æqua­
les.
cùm ſit triangulum FBL dictorum triangulorum octu­
plum.
quod oportebat quo〈que〉 demonſtrate.
9. quinti.
17.24. Ar
chimedis
de quad.
parab.
16. quimi
21.Archi­
medis de
quad.
pa­
rab.
His demonſtratis ſequitur Archimedes quaſi connectens ſe
〈que〉ntem propoſitionem cumijs, quæ ſuppoſita ſunt, inqui­
ens, ſi autem & in portione &c.
PROPOSITIO. II.
Si autem & in portione rectalinea, rectangu­
li〈que〉 coni ſectione contenta, figura rectilinea pla
ne inſcribatur, inſcriptæ figuræ centrum grauita­
tis erit in diametro portionis.

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