Commandino, Federico, Liber de centro gravitatis solidorum, 1565

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1qr, eodem, quo ſupra, modo oſtendemus fg ad pq, ut fh
ad pr.
ſed priſma ae ad ipſum ko eſt, ut fh ad pr. ergo
& ut fg axis ad axem pq.
ex quibus ſit, ut pyramis abcdf
54[Figure 54]
ad pyrami­
dem
klmnp
eandem ha
beat pro ­
portionẽ,
quam axis ad
axem.
quod
demonſtran
dum ſuerat.
Simili ra
tione in a­
liis priſma­
tibus & py
ramidibus eadem demonſtrabuntur.
THEOREMA XVII. PROPOSITIO XXI.
Priſmata omnia, & pyramides inter ſe propor
tionem habent compoſitam ex proportione ba­
ſium, & proportione altitudinum.
Sint duo priſmata ae, gm: ſitque priſmatis ae baſis qua
drilaterum abcd, & altitudo ef: priſmatis uero gm ba­
ſis quadrilaterum ghKl, & altitudo mn.
Dico priſma ae
ad priſma gm proportionem habere compoſitam ex pro
portione baſis abcd ad baſim ghkl, & ex proportione
altitudinis ef, ad altitudinem mn.
Sint enim primum ef, mn æquales: & ut baſis abcd
ad baſim ghkl, ita fiat linea, in qua o ad lineam, in qua p:
ut autem ef ad mn, ita linea p ad lineam q.
erunt lineæ
pq inter ſe æquales.
Itaque priſma ae ad priſma gm eam

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