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