Commandino, Federico
,
Liber de centro gravitatis solidorum
,
1565
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nis, quouſque in unum punctum r conueniant; erit pyra
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midis abcr, & pyramidis defr grauitatis centrum in li
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nea rh. </
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<
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id
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">ergo & reliquæ magnitudinis, uidelicet fruſti cen
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trum in eadem linea neceſſario comperietur. </
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<
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id
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">Iungantur
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db, dc, dh, dm: & per lineas db, dc ducto altero plano
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intelligatur fruſtum in duas pyramides diuiſum: in pyra
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midem quidem, cuius baſis eſt triangulum abc, uertex d:
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& in eam, cuius idem uertex, & baſis trapezium bcfe. </
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<
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id
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">erit
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igitur pyramidis abcd axis dh, & pyramidis bcfed axis
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d m: atque erunt tres axes gh, dh, dm in eodem plano
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daKl.</
s
>
<
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id
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s.000733
"> ducatur præterea per o linea ſt ipſi aK
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expan
abbr
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æquidiſtãs
">æquidiſtans</
expan
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,
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quæ lineam dh in u ſecet: per p uero ducatur xy æquidi
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ſtans eidem, ſecansque dm in
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z: & iungatur zu, quæ ſecet
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gh in
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="
grc
">φ.</
foreign
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tranſibit ea per q: &
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erunt
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grc
">φ</
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q unum, atque idem
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punctum; ut inferius appare
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bit. </
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<
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id
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">Quoniam igitur linea uo
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æquidiſtat ipſi dg, erit du ad
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uh, ut go ad oh. </
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<
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id
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">Sed go tri
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pla eſt oh. </
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<
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id
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">quare & du ipſius
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uh eſt tripla: & ideo pyrami
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dis abcd centrum grauitatis
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erit punctum u. </
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<
s
id
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s.000737
">Rurſus quo
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niam zy ipſi dl æquidiſtat, dz
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ad zm eſt, ut ly ad ym: eſtque
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ly ad ym, ut gp ad pn. </
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<
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id
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">ergo
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dz ad zm eſt, ut gp ad pn. </
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<
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id
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">Quòd cum gp ſit tripla pn;
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erit etiam dz ipſius zm tri
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pla. </
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>
<
s
id
="
s.000740
">atque ob eandem cauſ
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ſam punctum z eſt
<
expan
abbr
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centrũ
">centrum</
expan
>
gra
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/>
uitatis pyramidis bcfed. </
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>
<
s
id
="
s.000741
">iun
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cta igitur zu, in ea erit
<
expan
abbr
="
cẽtrum
">centrum</
expan
>
</
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