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
hæ 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 e­
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]
Quoniam autem oſtenſum eſt QM æqualem eſſe ipſi SN,
& MR ipſi NT, eodem quo〈que〉 modo oſtendetur OT

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