Valerio, Luca, De centro gravitatis solidorum, 1604

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1per conuerſionem rationis, vt NL ad LO, ita QH, ad
HE: & permutando, vt LN ad QH, ita LO ad EH:
ſed LN, oſtenſa eſt æqualis QH; æqualis igitur LO,
erit ipſi EH; ſed & OP, eſt æqualis ipſi PE, vt oſten­
dimus: duæ igitur LO, OP, duabus HE, EP æqua­
les erunt altera alteri, & angulos æquales continent LOP,
PEH, parallelis exiſtentibus LN, BH ſectionibus tri­
anguli DBH, quæ fiunt à duobus planis parallelis; ba­
ſis igitur LP, trianguli LOP, æqualis eſt baſi PH,
trianguli PEH, & angulus OPL, angulo EPH in pla­
no trianguli DBH, in quo DPE, eſt vna recta linea;
igitur LPH, erit vna recta linea, quæ cum ſit axis octa­
edri LKMGFH, & ſectus ſit in puncto P, bifariam,
erit punctum P, centrum octaedri LKMGEH. ſed &
centrum pyramidis ABCD.
Manifeſtum eſt igitur pro­
poſitum.
PROPOSITIO X.
Omne fruſtum pyramidis triangulam baſim
habentis, ſiue coni, ad pyramidem, vel conum, cu­
ius baſis eſt eadem, quæ maior baſis fruſti, & ea­
dem altitudo, eam habet proportionem, quam duo
latera homologa, vel duæ diametri baſium ipſius
fruſti, vnà cum tertia minori proportionali ad
prædicta duo latera, vel diametros; ad maioris ba­
ſis latus, vel diametrum.
Ad priſma autem, vel
cylindrum, cuius eadem eſt baſis, quæ maior baſis
fruſti, & eadem altitudo; vt tres prædictæ deìn­
ceps proportionales ſimul, ad triplam lateris, vel
diametri maioris baſis.

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