Valerio, Luca
,
De centro gravitatis solidorvm libri tres
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tur DH ad OF erit vt decem ad tria: ſed GC dupla
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eſt ipſius DH; igitur GC ad FO vt viginti ad tria: ſed
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quia tripla exiſtente AO ipſius OG, eſt tota AG ipſius
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AO ſeſquitertia, erit quoque GE, ipſius OF ſeſquiter
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tia, propter ſimilitudinem triangulorum AGE, AOF,
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hoc eſt qualium partium æqualium OF trium, talium GE
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quatuor; qualium eſt GC hoc eſt BG viginti, talium
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erit EG quatuor, & EC ſexdecim: dempta igitur EG
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ex GC, & addita ipſi BG, qualium eſt EC ſexdecim:
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talium erit BE vigintiquatuor: ſed vt vigintiquatuor ad
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ſexdecim, ita ſunt tria ad duo, quæ proportio eſt ſeſqui
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altera, ſeſquialtera igitur erit BE ipſius EC, oſtenſa eſt
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autem AF ipſi FE tripla. </
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<
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>Manifeſtum eſt igitur pro
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poſitum. </
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PROPOSITIO XXII.
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>Si duo triangula mixta prædicti generis verti
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cem communem habeant, qui eſt contactus, &
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baſes æquales in eadem recta linea, vel continuas,
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vel ſegmento interiecto, tota extra ſiguram verſa
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cauitate; centrum grauitatis compoſiti ex vtro
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que eſt pun ctum illud, in quo recta linea à vertice
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ad bipartitæ rectæ prædictis ſectionibus interce
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ptæ, in qua ſunt baſes dictorum triangulorum ſe
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ctionis punctum pertinens ſic diuiditur; vt pars,
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quæ eſt ad verticem ſit tripla reliquæ. </
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<
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>Sint duo prædicti generis triangula ABC, ADE ha
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bentia verticem A communem, qui eſt contactus recta.
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<
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>rum cum parabolis, tangente AB parabolam AC, & </
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