Valerio, Luca, De centro gravitatis solidorum, 1604

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1
PROPOSITIO VIII.
Si ſint tres magnitudines ſe ſe æqualiter exce­
dentes; & aliæ eiuſdem generis illis multitudine
æquales, binæque ſumptæ in duplicata primarum
proportione; erit vtriuſque ordinis minor pro­
portio compoſitæ ex primis ad compoſitam ex ſe­
cundis, quam compoſitæ ex ſecundis ad compoſi­
tam ex tertijs.
Sint tres magnitudines A, B, C, quarum C maxima
æque ſuperet B, atque
B, ipſam A. & totidem
eiuſdem generis D, E,
F, ſitque F ad E du­
plicata proportio ipſius
C ad B: & E ad D,
duplicata ipſius B ad
A.
Dico AD, ſimul
ad BE, ſimul mino­
tem eſſe proportionem
quam BE, ſimul ad
CF, ſimul.
Eſto enim
recta quæpiam GH,
ad aliam rectam ſibi in
directum poſitam HK,
vt magnitudo A ad ip
ſius F duplam (hoc
enim fieri poteſt) &
73[Figure 73]
ſuper baſim GK; conſtituatur triangulum GLK, atque
in eo deſcribatur parallelogrammum GHMN: & vt eſt

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