Valerio, Luca - De centro gravitatis solidorum

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DEFINITIONES.

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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