Valerio, Luca, De centro gravitatis solidorvm libri tres

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1EV ad VS, erit componendo, maior proportio ER ad
RT quàm ES ad SV: & per conuerſionem rationis mi­
nor proportio FR ad ET; quàm ES ad EV, & permu­
tando minor proportio ER ad ES quàm ET ad EV: ſed
ER maior erat quàm ES, ergo ET maior erit quàm EV:
& punctum T propinquius termino A, quàm punctum V.
Quod demonſtrandum erat.
PROPOSITIO XXIX.
Datæ figuræ circa diametrum, vel axim in alte
ram partem deficienti, ſuper baſim rectam lineam
vel circulum, vel ellipſim; cuius figuræ baſis, &
ſectiones omnes parallelæ ſegmenta æqualia dia­
metri vel axis intercipientes ita ſe habeant, vt
quarumlibet trium proximarum minor proportio
ſit minimæ ad mediam, quàm mediæ ad maxi­
mam; figura quædam ex cylindris, vel cylindri
portionibus, vel parallelogrammis æqualium al­
titudinum circumſcribi poteſt, cuius centrum gra­
uitatis ſit propinquius baſi quàm cuiuſlibet datæ
figuræ, qualem diximus quæ prædictæ figuræ cir
cadiametrum, vel axim circumſcripta ſit.
Sit figura circa diametrum, vel axim in alteram partem de­
ficiens qualem diximus, cuius bafis circulus, vel ellipſis vel
recta linea AC, axis autem vel diameter BD.
Et data figu­
ra ipſi ABC figuræ circumſcripta compoſita ex cylindris,
vel cylindri portionibus, vel parallelogrammis æqualium
altitudinum EF, GH, AK.
Dico figuræ ABC alteram
figuram, qualem diximus poſſe circumſcribi, cuius centrum

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