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+//Chapter 3, Example 3.10, page 92
+clc
+//Initialisation
+f=5*10**9                                                         //frequency in Hz
+c=3*10**8                                                         //speed of light
+h1=6                                                              //in metre
+h2=2                                                              //in metre
+pi=3.14
+
+//Calculation
+h=c*f**-1                                                       //wavelength 
+w=atan(h1*2250**-1)                                        //grazing angle in radian
+w1=w*180*pi**-1                                        //grazing angle in degree
+a=((2*pi*h1*h2)*(h*300)**-1)*3.14*180**-1
+e=sin(a) 
+F=e*2*180*pi**-1                                              //PGF value (wrong value calculated in textbook)
+LR=20*log10(F)                                              //Decrease in received signal level
+
+
+//Results
+printf("(1) Grazing angle = %.2f degree",w1)
+printf("\n(2) PGF value = %f",F)                                              //The answer provided in the textbook is wrong
+printf("\n(3) Decrease in received signal level = %.2f dB",LR)                //The answer provided in the textbook is wrong