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//Example4.4//
//(a)
RFe=0.124;//nm //atomic radius of iron
r=2*RFe
mprintf("r = %f nm",r)
//(b)
RAl=0.143;//nm //atomic radius of Aluminium
r1=2*RAl
mprintf("\nr1 = %f nm",r1)
//(c)
a=2;//given
RO=0.132;//nm // Ionic radius of Oxygen
b=cosd(30);//given
r2=2*(a*RO)*(b)
mprintf("\nr2 = %f nm",r2)
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