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+//Chapter 7, Example 7.1, page 293
+clc
+
+//Initialisation
+h=200                                //height in m
+d=30*10**3                           //distance in km
+R=40*10**-6                           //height in km
+pi=3.14
+
+//Calculation
+phi=atan(h*d**-1)               //in radian
+phi1=phi*180/pi                 //in degree
+n=cos(phi1)
+r=round(n)/R                         //radius
+
+//Results
+printf("Radius = %.1f km",r)