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+//Chapter 3, Example 3.15, page 118
+clc
+
+//Initialisation
+d=40                                           //length in meter
+Am=2                                          //area in square meter
+f=10*10**9                                    //frequency in hertz
+
+//Calculation
+As=40                                      //using graph fig 3.36, As can be obtained 
+As1=30                                     //using graph fig 3.37, As can be obtained
+
+//Results
+printf("Loss in the summer for trees with leaves, As = %d dB",As)
+printf("\nLoss in winter for trees without leaves, As = %d dB",As1)