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+//Example number 7.2, Page number 7.13
+
+clc;clear;close
+
+
+// Variable declaration
+a=3.61*10^-7 // in m
+BC=sqrt(2)/2 //in m
+AD=(sqrt(6))/2// in m
+// Result
+printf("i)Surface area of the face ABCD = %.e mm^2",(a^2))
+printf("\nii)Surface area of plane (110) = %.2e atoms/mm^2",((2/(a*sqrt(2)*a))))
+printf("\niii)Surface area of plane(111)= %.3e atoms/mm^2",(2/(BC*AD*a^2)))