Valerio, Luca, De centro gravitatis solidorum, 1604

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1tes A deficiens, cuius baſis BC. Dico fieri poſse quod
proponitur: ducta enim per verticem figuræ A, baſi BC,
parallela, atque ideo figuram ipſam contingente, abſol­
uatur parallelogrammum BL, ſectaque diametro AD,
bifariam, & ſingulis eius partibus ſemper bifariam, du­
cantur per puncta ſectionum rectæ lineæ baſi BC, & in­
ter ſe parallelæ, atque ita multiplicatæ ſint ſectiones,
vt ſecti parallelogrammi in parallelogramma æqua­
lia, & eiuſdem altitudinis quælibet pars, vt paralle­
logrammum BF, ſit minus ſuperficie propoſita, cu­
ius parallelogram­
mi latus EF, ſe­
cet figuræ termi­
num BAC, in
punctis GH, &
diametrum AD, in
puncto K. erit igi­
tur GK, æqualis
KH: per omnia
igitur puncta ſe­
ctionum termini
12[Figure 12]
BAC, quæ à prædictis fiunt lineis parallelis, ſi ducan­
tur diametro AD parallelæ, figura quædam ipſi ABC,
inſcribetur, & altera circumſcribetur ex parallelogram­
mis æqualium altitudinum.
Dico harum figurarum
inſcriptam ſuperari à circumſcripta minori ſpacio ſuper­
ficie propoſita.
Quoniam enim omnia parallelogramma,
quibus figura circumſcripta ſuperat inſcriptam ſimul ſum­
pta ſunt æqualia BF parallelogrammo: ſed parallelo­
grammum BF, eſt minus ſuperficie propoſita: exceſſus
igitur quo figura circumſcripta inſcriptam ſuperat, minor
erit ſuperficie propoſita.
Fieri igitur poteſt, quod propo­
nebatur.

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