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//Variable declaration
h=1;
k=1;
l=0;
d=0.203*10**-9; //spacing(m)
//Calculation
a=d*sqrt(h**2+k**2+l**2); //length of unit cell(m)
V=a**3; //volume of unit cell(m**3)
r=sqrt(3)*a/4; //radius of the atom(m)
//Result
printf('length of unit cell is %0.3f *10**-9 m \n',(a*10**9))
printf('volume of unit cell is %0.3f *10**-27 m**3 \n',(V*10**27))
printf('radius of the atom is %0.3f *10**-9 m \n',(r*10**9))
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