Valerio, Luca, De centro gravitatis solidorvm libri tres

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1ita tertia cum ſexta ad quartam; videlicet, vt duo ſoli­
da, & quod ſit ex FH,
HG, EH, & quod
ex GK, KF, EK, vnà
cum duabus tertiis &
cubi ex EH, & cu­
bi ex EK, ad ſolidum
ex FE, EG, KH, ita
erit tota ſphæræ, vel
ſphæroidis portio AB
CD, ad cylindrum, vel
portionem cylindricam
NO.
Quod demon­
ſtrandum erat.
161[Figure 161]
PROPOSITIO XXI.
Omnis trianguli comprehenſi ſectione para­
bola, ex duabus rectis lineis, quarum altera ſe­
ctionem tangat, altera in eam incidat diametro
ſectionis ex contactu æquidiſtans, centrum graui­
tatis eſt punctum illud, in quo recta linea ex con­
tactu diuidens incidentem ita vt pars, quæ ſectio­
nem attingit ſit ſeſquialtera reliquæ, ſic diui­
ditur, vt pars quæ eſt ad contactum ſit tripla
reliquæ.
Sit triangulum ABC comprehenſum ſectione parabo­
la ADB, & duabus rectis lineis, quarum altera AC tan­
gat ſectionem in puncto A, reliqua autem BC, in eam
incidens in puncto B, ſectionis diametro ex puncto A,
æquidiſtans intelligatur: & per centrum grauitatis trian-

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