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

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1 60[Figure 60]
Pariquè ratione ſi quin〈que〉 fuerint magnitudines, eodem
modo tres mediæ iungatur ſimul, ita vttres ſint duntaxat magni
tudines.
& ſic in infinitum. quod demonſtrare oportebat.
COROLLARIVM.
Ex hoc elici poteſt. quòd ſi fuerint quotcun〈que〉 magnitudi
nes proportionales; & alię ipſis numero æquales, & in eadem
proportione, vt ſcilicet ſit (vt in prima figura) A ad B, vt C
ad D, B verò ad E, vt D ad F. deinde vt E ad G, ſic F
ad H, & ita deinceps, ſi plures fuerint magnitudines, ſi­
militer erit A ad omnes BEG ſimul ſumptas, vt C ad om­
nes ſimul DFH.
Primùm quidem A eſt ad B, vt C ad D. & quoniam ma
gnitudines ſunt proportionales, ex ęquali erit A ad E, vt
ad F. ſimiliter A ad G, vt C ad H. Ex quibus ſequitur
A ad BE ſimul ita eſſe, vt C ad DF. A verò ad omnes
BEG ſimul, vt C ad omnes ſimul DFH. & ita ſi plures fue
rint magnitudines.
22. quinti.
LEMMA. III.
Sit triangulum ABC, cuiuslatus BC in quotcun〈que〉 di­
uidatur partes æquales BE ED DF FC. & a punctis EDF
ipſi AB equidiſtanres ducantur EG DH FK. rurſus à pun
ctis GHK ipſi BC ęquidiſtantes ducantur GL HM KN.
Dico triangulum ABC ad omnia triangula ALG GMH
HNK KFC ſimulſumpta eandem habere proportionem,
quam habet CA ad AG.

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