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diff --git a/2863/CH2/EX2.45/ex2_45.sce b/2863/CH2/EX2.45/ex2_45.sce
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+//chapter 2
+//may june 2013
+//Aem=Gdmax*lamda^2/4*pi;
+printf("\n");
+Gdmax=1.5;//for half wave dipole
+f=10^9;
+c=3*10^8;
+lamda=c/f;
+Aem=(Gdmax*(lamda)^2)/(4*(%pi));
+printf("the effective aperture is %gm^2",Aem);
+