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

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1
Oſtenſum eſt enim BD ſexdecim eſſe, & BT quatuor, & FE
itidem quatuor exiſtere.
Ex demonſtratione autem Archime
dis decimæ nonæ ptopoſitionis de quadratura paraboles cla­
rè elicitur BD quadruplam eſſe ipſius BT.
Ex quibus etiam ſequitur FE QL inter ſe æquales eſſe. am­
bo enim ſunt, vt quatuor.
90[Figure 90]
Præterea oſtendendum eſt triangulum AFB triangulo BLC
ęquale eſſe, portionem què paraboles AFB portiom BLC ęqua
lem.
Ampliùs triangulum AIF triangulo CML, & portio­
nem AIF portioni CML æqualem eſſe, & reliqua triangula
reliquis triangulis, acportiones portionibus ęquales eſſe.
Ex vigeſima prima propoſitione Archimedis de quadratu­
ra paraboles triangulum ABC vniuſcuiuſ〈que〉 trianguli AFB
BLC eſt octuplum. ergo ad ambo eandem hent proportionem. qua
re triangula AFB BLC inter ſe ſunt ęqualia.
At vero quoniam

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