Commandino, Federico, Liber de centro gravitatis solidorum, 1565

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1los contineant. Dico ſolidum ab ad ſolidum ace idem ha
bere proportionem, quam axis de ad axem ef.
Si enim
axes in eadem recta linea fuerint conſtituti, hæc duo ſoli­
da, in unum, atque idem ſolidum conuenient.
quare ex
iis, quæ proxime tradita ſunt, habebit ſolidum ab ad ſo­
lidum ac eandem proportionem, quam axis de ad ef
axem.
Si uero axes non ſint in eadem recta linea, demittan
tur a punctis d, ſ perpendiculares ad baſis planum, dg, fh:
& jungantur eg, eh.
Quoniam igitur axes cum baſibus
æquales angulos continent, erit deg angulus æqualis an­
47[Figure 47]
gulo feh: & ſunt
anguli ad gh re­
cti, quare & re­
liquus edg æqua
lis erit reliquo
efh: & triangu­
lum deg triangu­
lo
feh ſimile.
er­
go gd ad de eſt,
ut hf ad e: & per
mutando gd ad
hf, ut de ad cf.

48[Figure 48]
Sed ſolidum ab
ad ſolidum ac
eandem propor­
tionem habet,
quam dg altitu­
do ad altitudinem
fh.
ergo & ean­
dem
habebit, quam
axis de ad ef axem
Poſtremo ſint
ſolidi parallepi
peda ab, cd in

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