Valerio, Luca, De centro gravitatis solidorvm libri tres

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1C ad B, ita fiat HM, ad Mque & vt B ad A, ita QM, ad
MP
, & ipſi GK, parallelæ TPR, VQS, ducantur.
Quoniam igitur eſt vt C, ad duplam ipſius F, ita GH, ad
HK
; erit vt C ad F, ita eſt par llelogrammum GM, ad
triangulum
MHK: ſed vt C, ad B, ita eſt HM, ad Mque
hoc
eſt parallelogrammum GM, ad parallelogrammum
MV
: & vt F, ad E, ita triangulum MHK, ad triangu­
lum
MQS, ob duplicatam proportionem eius, quæ eſt
HM
ad Mque hoc eſt ipſius C ad B; vt igitur trapezium
NK
, ad NS trapezium, ita erit, per præcedentem, CF,
ſimul
ad BE ſimul.
Rurſus quoniam eſt conuertendo, vt
parallelogrammum
MV, ad parallelogrammum GM, ita
B
ad C. ſed vt parallelogrammum GM, ad triangulum
KHM
, ita erat C, ad F: & vt triangulum KHM, ad
triangulum
QSM, ita F ad E; erit ex æquali, vt paral­
lelogrammum
MV, ad triangulum SQM, ita B, ad E.
Similiter ergo vt ante erit vt trapezium NS, ad NR tra­
pezium
, ita EB, ſimul ad AD, ſimul.
Rurſus, quoniam
æque
excedit LV, ipſam LT, atque LG, ipſam LV;
minor
erit proportio LT ad LV, quam LV, ad LG: eſt
autem
trianguli LTR ad triangulum LVS, duplicata
proportio
ipſius LT, ad LV, & trianguli LVS, ad trian­
gulum
LGK, duplicata ipſius LV, ad LG, propter ſi­
militudinem
triangulorum; minor igitur proportio erit
trianguli
LTR, ad triangulum LVS, quam trianguli
LVS
, ad triangulum LGK; dempto igitur triangulo
LNM
, communi, minor erit proportio trapezij NR, ad
trapezium
NS, quam trapezij NS, ad trapezium NK.
Sed vt trapezium NR, ad trapezium NS, ita eſt conuer­
tendo
AD ſimul ad BE, ſimul: & vt trapezium NS, ad
trapezium
NK, ita BE, ſimul ad CF, ſimul; minor igi­
tur
proportio erit AD, ſimul ad BE ſimul, quam BE ſi­
mul
ad CF, ſimul.
Quod demonſtrandum erat.

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