32* DE PRESSIONE PONDKRIS 



II. Seciindo momenta refpedu axis A B crunt fc- 

 qucntia 



pro pundo V— AV-^-^xv-^-yvv 



V — av — ^xv-^-yvv 



\J — ^av — (ixv + yvv 



u — — av + ^xv + yvv. 



Summa — +^yvv 



III. Momcnta refpedu axis A C erunt 



pro pundo V — a x + ^ x x -{- y x v 



c z:: — a X ■{- ^ x x — y x v 



U rr 4- a A- 4- ^ x x — y x v 



11— - a X + ^ X X + y X v 



•'^Summa — +at.{ixx. 



Hae formulae ducantur in elementum areae qnod 

 cft dxdv ac prirr.o fumatur x conllans et facfl* 

 integratione ponatur 



v—yiY—y-V[aa-xx) 

 •t hflbebimus 



j^afdxdv~^adxV{aa — xx) 



^yfvvdvdxzz.\yy^ dx — \ydx{aa — xx)* 

 j^^fxxdxdv—Ji^^jx^dxzi^^^x^dxiaa-xxy'*. 



Hac formulae denuo integrentur per totum quadta»* 



tem BAC, ac reperietur 



fydx—^-naa^ hincque ^afjdxiniLiiatt 

 fy dx—^x^aa-xxf+Xa fdxyi^aa-xx\ 



pcr totum quadrantem 



fydx — Sn.a\ hinc \yfy*dx—\y%a* 



