//Moment of inertia
//refer fig.9.41
sumAiyi=250*10*5+2*40*10*(10+20)+40*10*(10+5)+40*10*255+250*10*(10+125)  //mm^3
A=2*250*10+40*10*4  //mm^2
ybar=sumAiyi/A
Ixx=((250*10^3)/12)+(250*10*(73.03-5)^2)+(((10*40^3)/12)+40*10*(73.03-30)^2)*2+((40*10^3)/12)+40*10*(73.03-15)^2+((10*250^3)/12)+250*10*(73.03-135)^2+((40*10^3)/12)+40*10*(73.03-255)^2  //mm^4
printf("Ixx=%.2d mm^4",Ixx)