Valerio, Luca, De centro gravitatis solidorum, 1604

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1dentium parallelogramma in plano EG exiſtentia erunt
inter ſe æqualia, atque ſimilia, ſcilicet MS ipſi OQ, &
ZO, ipſis RV: ſitque axis KL pars tertia L β, quarta
autem L δ.
Quoniam ìgitur ex ſupra demonſtratis priſ­
matis ABCDTMPQ eſt centrum grauitatis α; duo­
rum autem priſmatum oppoſitorum ABYONZ, CDS
RXV, centrum grauitatis β, erit reliqui ex fruſto AB
97[Figure 97]
CDEFGH demptis quatuor prædictis pyramidibus in
α β centrum grauitatis, quod ſit γ.
Nam ex primo li­
bro conſtat punctum α cadere ſupra punctum β, ſi com­
pleatur trapezium ACGE, cuius diameter erit KL.
Sed
earum quatuor pyramidum eſt centrum grauitatis δ.
Si
enim baſium, quibus binæ oppoſitæ pyramides inſiſtunt
centra grauitatis, & bini oppoſiti vertices ſingulis rectis li-

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