Valerio, Luca
,
De centro gravitatis solidorum
,
1604
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igitur compoſita ex primis vtriuſque ordinis ad compo
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ſitam ex ſecundis, ita erit compoſita ex tertiis ad com
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poſitam ex quartis; videlicet vt rectangulum BDE, quod
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æquale eſt rectangulo EBD vna cum quadrato BD, ad
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rectangulum BQE, quod æquale eſt rectangulo EBQ
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vnà cum quadrato BQ, ita erit tota AD ad totam TQ.
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Sed vt rectangulum BDE ad rectangulum BQE ita eſt
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AD quadratum, ad quadratum RQ, hoc eſt ita circu
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lus, vel ellipſis circa AC, ad circulum, vel ſimilem illi
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ellipſem circa RS; vt igitur AD ad TQ, hoc eſt in ea
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rum duplis vt AC ad TV, ita erit circulus, vel ellipſis
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circa AC ad circulum, vel ellipſem circa RS. </
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<
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>Similiter
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oſtenderemus eſſe vt AC ad
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, ita circulnm, vel elli
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pſim circa AC, ad circulum, vel ellipſem, circa
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: con
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uertendo igitur, & ex æquali erunt binæ in eadem propor
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tione, vt
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ad TV, ita circulus, vel ellipſis circa
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ad circulum, vel ellipſim circa RS: & vt TV ad AC, ita
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circulus, vel ellipſis circa RS ad circulum, vel ellipſim
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circa AC. Rurſus, quoniam tres rectæ lineæ incipienti
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à minima
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, TX, A
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K
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ſunt binæ ſumptæ proportio
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nales quadratis ex B
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, BX, B
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K
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, hoc eſt quadratis ex
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F
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, QX, DK; duplicata erit proportio
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ad TX ip
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ſius F
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ad QX, & TX ad AK duplicata ipſius QX ad
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D
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K
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: ſed rectæ F
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, QX, DK, ſeſe æqualiter excedunt,
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vtpote proportionales ipſis BF, BQ, BD, propter ſi
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militudinem triangulorum; minor igitur proportio erit
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F ad TQ, quàm TQ ad AD: quare his proportiona
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lium minor erit proportio circuli, vel ellipſis circa
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ad
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circulum, vel cllipſim circa RS, quàm circuli, vel elli
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pſis circa RS, ad circulum, vel ellipſim, circa AC.
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<
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>Similiter quæcumque ſectiones per prædicta axis, vel dia
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metri BD puncta ſectionum fierent vt dictum eſt ad ver
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ticem retrocedenti oſtenderentur quælibet ternæ inter ſe
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proximæ, binæque ſumptæ vtriuſque ordinis proportio-</
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