Commandino, Federico
,
Liber de centro gravitatis solidorum
,
1565
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pagenum
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35
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xlink:href
="
023/01/077.jpg
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type
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main
">
<
s
id
="
s.000721
">Sit fruſtum ae a pyramide, quæ triangularem baſim ha
<
lb
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beat abſciſſum: cuius maior baſis triangulum abc, minor
<
lb
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def; & axis gh. </
s
>
<
s
id
="
s.000722
">ducto autem plano per axem & per
<
expan
abbr
="
lineã
">lineam</
expan
>
<
lb
/>
da, quod ſectionem faciat dakl quadrilaterum; puncta
<
lb
/>
Kl lineas bc, ef bifariam ſecabunt. </
s
>
<
s
id
="
s.000723
">nam cum gh ſit axis
<
lb
/>
fruſti: erit h centrum grauitatis trianguli abc: & g
<
lb
/>
<
figure
id
="
id.023.01.077.1.jpg
"
xlink:href
="
023/01/077/1.jpg
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number
="
68
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lb
/>
<
arrow.to.target
n
="
marg87
"/>
<
lb
/>
centrum trianguli def: cen
<
lb
/>
trum uero cuiuslibet triangu
<
lb
/>
li eſt in recta linea, quæ ab an
<
lb
/>
gulo ipſius ad
<
expan
abbr
="
dimidiã
">dimidiam</
expan
>
baſim
<
lb
/>
ducitur ex decimatertia primi
<
lb
/>
libri Archimedis de
<
expan
abbr
="
cẽtro
">centro</
expan
>
gra
<
lb
/>
<
arrow.to.target
n
="
marg88
"/>
<
lb
/>
uitatis planorum. </
s
>
<
s
id
="
s.000724
">quare
<
expan
abbr
="
cen-trũ
">cen
<
lb
/>
trum</
expan
>
grauitatis trapezii bcfe
<
lb
/>
eſt in linea kl, quod ſit m: & à
<
lb
/>
puncto m ad axem ducta mn
<
lb
/>
ipſi ak, uel dl æquidiſtante;
<
lb
/>
erit axis gh diuiſus in portio
<
lb
/>
nes gn, nh, quas diximus: ean
<
lb
/>
dem enim proportionem ha
<
lb
/>
bet gn ad nh,
<
expan
abbr
="
quã
">quam</
expan
>
lm ad mk. </
s
>
<
lb
/>
<
s
id
="
s.000725
">At lm ad mK habet eam,
<
expan
abbr
="
quã
">quam</
expan
>
<
lb
/>
duplum lateris maioris baſis
<
lb
/>
bc una cum latere minoris ef
<
lb
/>
ad duplum lateris ef unà cum
<
lb
/>
latere bc, ex ultima eiuſdem
<
lb
/>
libri Archimedis. </
s
>
<
s
id
="
s.000726
">Itaque à li
<
lb
/>
nea ng abſcindatur, quarta
<
lb
/>
pars, quæ fit np: & ab axe hg abſcindatur itidem
<
lb
/>
quarta pars ho: & quam proportionem habet fruſtum ad
<
lb
/>
pyramidem, cuius maior baſis eſt triangulum abc, & alti
<
lb
/>
tudo ipſi æqualis; habeat op ad pq.</
s
>
<
s
id
="
s.000727
"> Dico centrum graui
<
lb
/>
tatis fruſti eſſe in linea po, & in puncto q.</
s
>
<
s
id
="
s.000728
"> namque ipſum
<
lb
/>
eſſe in linea gh manifeſte conſtat. </
s
>
<
s
id
="
s.000729
">protractis enim fruſti pla</
s
>
</
p
>
</
chap
>
</
body
>
</
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>
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