Valerio, Luca, De centro gravitatis solidorvm libri tres

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1
Manifeſta item ſunt hæc omnia, ex ijs, quæ in eodem li­
bro de ſphæroidibus, & conoidibus demonſtrat Archi­
medes.
PROPOSITIO IX.
Omnis fruſti pyramidis triangulam baſim ha­
bentis ad priſtina, cuius baſis eſt maior baſis fru­
ſti, & eadem altitudo, cam habet proportionem,
quàm rectangulum contentum duobus lateribus
homologis baſium oppoſitarum, vnà cum tertia
parte quadrati differentiæ dictorum laterum, ad
maioris lateris quadratum.
Ad pyramidem autem,
cuius baſis eſt maior baſis fruſti, & eadem altitu­
do, vt prædictum rectangulum, vna cum prædicti
quadrati tertia parte, ad tertiam partem quadrati
maioris lateris.
Sit pyramidis triangulam baſim habentis fruſtum AB
CD EF: laterum autem homo­
logorum AB, DE, triangulorum
ſimilium oppoſitorum ABC, D
EF, ſit differentia DG: & eiuſ­
dem altitudinis fruſto ſit priſma
DEFCHK: & pyramis intelli­
gatur ADEF.
Dico fruſtum
BDF ad priſma HKF, eſſe vt
rectangulum DEG vna cum ter­
tia parte quadrati DG.
Ad qua­
dratum DE: ad pyramidem au­
tem ADEF, vt prædictum rectan­
142[Figure 142]
gulum DEG, vnà cum tertia parte quadrati DG, ad ter­

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