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+// Example 2.27, page no-46
+clear
+clc
+h=1
+k=1
+l=0
+d=2*10^-10//m
+a=d*sqrt(h^2+k^2+l^2)
+R=a/(2*sqrt(2))
+printf("The lattice constant is %.3f*10^-10 m\nThe atomic radius of the crystal is %.1f *10^-10 m",a*10^10,R*10^10)