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+//Chapter 7: Solid State
+//Problem: 7
+clc;
+
+//Declaration of Variables
+r = 174.6 // pm
+
+// Solution
+a = r * sqrt(8)
+mprintf("For 200 plane: h = 2, k = 0, l = 0\n")
+d200 = a / sqrt(2 ** 2)
+mprintf(" d200 = %.1f pm\n",d200)
+mprintf(" For 200 plane: h = 2, k = 2, l = 0\n")
+d220 = a / sqrt(2 ** 2 + 2 ** 2)
+mprintf(" d220 = %.1f pm", d220)