Valerio, Luca, De centro gravitatis solidorvm libri tres

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1nium prædictorum cylindri AE cylindrorum ſupremus
FE, cuius axis BH, & communis ſectio plani per pun­
ctum H tranſeuntis baſi hemiſphærij cum plano per axim
BD, ſit recta FGKHMNL.
Quoniam igitur rectan­
gulum DHB bis vna cum duobus quadratis DH, BH,
æquale eſt BD quadrato: & rectangulum DHB bis
vna cum quadrato BH, eſt rectangulum ex BD DH tan­
quam vna, & BH; rectangulum ex BD, DH tanquam
vna & BH, vna cum quadrato DH æquale erit quadra­
to BD, hoc eſt quadrato FH: quorum quadratum KH
æquale eſt rectangulo ex BD, DH, tanquam vna, & BH;
reliquum igitur quadrati FH dempto quadrato KH æ­
quale erit reliquo quadrato DH, hoc eſt quadrato GH:
& quadruplum quadruplo reliquum quadrati FL dempto
quadrato MK toti GN quadrato, hoc eſt reliquum circu
li, FL dempto circulo MK, æquale circulo GN.
Qua­
re & GP, cylindrus reliquo cylindri FE dempto QK,
cylindro æqualis erit, propter æqualitatem altitudinum.
Similiter oſtenderemus ſingula reliqua cylindrorum eiuſ­
dem altitudinis, in quos totus cylindrus AE ſectus fuit,
demptis cylindris hemiſphærio circumſcriptis æqualia eſ­
ſe ſingulis cylindris cono EDR inſcriptis, quæ inter ea­
dem plana interijciuntur.
Tota igitur figura ex prædictis
cylindrorum reſiduis reliquo cylindri AE, dempto he­
miſphærio inſcripta æqualis erit figuræ cono EDR in­
ſcriptæ: deficit autem vtraque harum figurarum hæc à co­
no ADR, illa à reſiduo cylindri AE dempto hemiſphæ­
rio minori exceſsu magnitudine vtcumque propoſita; re­
liquum igitur cylindri AE dempto hemiſphærio æquale
eſt cono EDR, ſed conus EDR; hoc eſt conus ABC cylin
dri AE eſt pars tertia; reliquum igitur cylindri AE dem­
pto hemiſphærio, cylindri AE eſt pars tertia, hoc eſt cylin­
drus AE triplus dicti reſidui: quamobrem AE cylindrus ſeſ­
quialter hemiſphærij ABC: & conuertendo, hemiſphærium

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