Valerio, Luca, De centro gravitatis solidorvm libri tres

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1ABCDFGH, ad pyramidem, vel conum ABCD.
Rurſus quoniam axis DE, & latera pyramidis, vel coni
ABCD
, ſecantur plano trianguli, vel circuli FGH, baſi
ABC
, parallelo; erit componendo, vt AD, ad DF, hoc
eſt
, vt AC ad FH, propter ſimilitudinem triangulorum,
hoc
eſt vt AC, ad CL, ita ED, ad DK; & per conuer­
ſionem
rationis, vt AC, ad AL, ita DE, ad EK: ſed vt
DE
ad EK, ita eſt pyramis, vel conus ABCD, ad py­
ramidem
, vel conum ABCK; vt igitur AC, ad AL,
ita
eſt pyramis, vel conus ABCD, ad pyramidem, vel
conum
ABCK; ſed vt tres lineæ AL, FM, OQ ſimul
ad
AC, ita erat fruſtum ABCFGH, ad pyramidem,
vel
conum ABCD; ex æquali igitur, erit vt tres lineæ
AL
, FM, OQ, ſimul ad AL, ita fruſtum ABCFGH,
ad
pyramidem, vel conum ABCK. Rurſus, quoniam
tres
exceſſus AL, FM, OQ, ſunt deinceps proportio­
nales
in proportione totidem terminorum AC, FH, NO,
erunt
vt AL, FM, OQ, ſimul ad AL, ita AC, FH,
NO
, ſimul ad AC: ſed vt AL, FM, OQ, ſim ul ad
AL
, ita erat fruſtum ABCFGH, ad pyamidem, vel
conum
ABCK; vt igitur tres lineæ AC, FH, NO, ſi­
mul
, ad AC, ita erit fruſtum ABCFGH, ad pyrami­
dem
, vel conum ABCK.
Sed vt AC, ad ſui triplam, ita
eſt
pyramis, vel conus ABCK ad priſma, vel cylindrum,
cuius
eſt eadem baſis ABC, & eadem altitudo cum py­
ramide
, vel cono ABCK; ex æquali igitur, erit vt tres
lineæ
AC, FH, NO, ſimul ad ipſius AC, triplam, ita
fruſtum
ABCFGH, ad priſma, vel cylindrum, cu­
ius
baſis ABC, & eadem altitudo pyramidi, vel cono
ABCK
: ideſt eadem, fruſto ABCFGH.
Manifeſtum
eſt
igitur propoſitum.

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