Valerio, Luca, De centro gravitatis solidorum, 1604

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1
DEFINITIONES.
I.
Figuræ aliquæ planæ multilateræ centrum ha­
bere dicuntur punctum illud, in quo omnes rectæ
lineæ vel angulos oppoſitos iungentes bifariam
ſecantur, vel ab angulis ductæ ad laterum op­
poſitorum bipartitas ſectiones in eaſdem ra­
tiones.
II.
Circa diametrum eſt figura plana, in qua re­
cta quædam, quæ diameter figuræ dicitur, omnes
rectas alicui parallelas, à figura terminatas bi­
fariam diuidit.
III.
Octaedrum communiter dictum, eſt figura ſoli­
da octo triangulis binis parallelis, æqualibus, &
ſimilibus comprehenſa.
IIII.
Polyedri regularis centrum dicitur punctum,
in quo omnes rectæ lineæ, quæ ad angulos oppo­
ſitos pertinent bifariam diuiduntur.

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