Valerio, Luca, De centro gravitatis solidorum, 1604

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1cumque multiplicatione; ſint duæ partes æquales proximæ
baſi DF, FQ: & per puncta FQ duo plana baſium pla­
no parallela tres prædictas figuras ſolidas ſecare intelli­
gantur: ſecabunt autem & tres figuras per axim, eruntque
ſectiones rectæ lineæ ad diametrum figurarum ordinatim
applicatæ propter
plana ſecantia pa
rallela: trium au­
tem ſolidorum ſe
ctiones & baſes
omnes circuli, ter
ni in ſingulis pla­
nis: ac primi qui­
dem ordinis ſint
ij, quorum diame­
tri ſunt baſes trium
figurarum per axim,
trianguli ſcilicet,
parabolæ, & hy­
perboles, quæ præ
dictas figuras ſoli
das deſcribunt, re
ctæ lineæ AC,
MN, KL.
Se­
cundi verò reten­
to eodem ordine
figurarum tres αζ,
βε, γδ.
Tertij
denique ordinis
SZ, TY, VX.
126[Figure 126]
Quoniam igitur eſt vt EB, ad BD, ità quadratum MD,
ad quadratum DK, ideſt conus MBN, ſi deſcribatur eo­
dem vertice B, ad conum KBL.
Et vt IB, ad BE, ità eſt
conoides MBN, ad conum MBN, in proportione ſcili-

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