DelMonte, Guidubaldo, In duos Archimedis aequeponderantium libros Paraphrasis : scholijs illustrata

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1Ducantur à punctis MN ipſi AGE ęquidiſtantes QMR
SNT
. erunt vti〈que〉 AQRG, & GSTE parallelogramma.
Quoniam
igitur parallelogramma AK GF in æqualibus
ſuntbaſibus
AG GE, & in ijſdem parallelis; erunt AK
inter
ſe ęqualia.
& quoniam AC GK EF ſunt ęquidiſtantes;
erit
angulus CAG ipſi KGE ęqualis, & KGA ipſi
æqualis
; & horum oppoſiti inter ſe ſunt ęquales; paralle­
logrammum
GF ipſi AK ęquale, & ſimile exiſtit.
Ita〈que〉
ſi
GF colloceturſuper AK, rectè congruet: eruntquè paral­
lelogramma
inuicen coaptata.
lineęquè GE AG, GK AC, &
reliquæ
coaptatæ erunt.
quare eorum centra inui­
cem
coaptata erunt.
hoc eſt N erit in puncto M. Quoniam
autem
à punctis MN (quod nunc intelligitur vnum tantum
eſſe
punctum) ductæ fuerunt ST QR ipſi AGE æquidi­
ſtantes
, linea ST coaptabitur cum QR, quippe cùm ambæ
lineæ ab vno puncto prodeuntes ipſi AG ęquidiſtantes
eſſe
debeant.
punctum igitur S in Q, & T in R coaptabi­
tur
.
eritquè QM ipſi SN ęqualis, & MR ipſi NT. ac pro
pterea
linea GS parallelogrammi GT erit coaptata in A〈que〉
& ET coaptata erit in GR parallelogrammi AR. Vnde
rit
AQ ęqualis GS, cùm ſint coaptatæ; & GR ipſi ET ę­
qualis
; cùm ſint quo〈que〉 coaptatę.
Quocirca pa­
rallelogramma
AR GT ſunt inuicem coaptata, paral­
lelogrammorumquè
oppoſita latera ſunt inter ſe ęqualia, erunt
AQ
GS GR ET inter ſe ęqualia.
Nunc autem intelligantur
parallelogramma
AK GF non ampliùs coaptata.
& quoniam
lineę
QMR, & SNT ſuntipſi AGE parallelę; & AQ GR,
GS
ET, inter ſe ſuntæquales, & ęquidiſtantes; puncta RS in
vnum
coincident punctum.
eritquè QST linea recta. ex qui
bus
patet, rectam lineam, quæ coniungit centra grauitatis MN
ipſi
AGE æquidiſtantem exiſtere.
eodemquè modo oſtende­
tur
rectas lineas, quæ coniungunt grauitatis centra NO, cen­
traquè
OP, ipſi AB æquidiſtantes eſſe.
Vnde ſequitur lineam
MNOP
rectam eſſe.
Quare primùm conſtat grauitatis centra
in
recta linea exiſtere.
36. primi.
29. primi.
34. primi.
5. post, hu­
ius
.
34. primi.
48[Figure 48]

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