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diff --git a/1697/CH3/EX3.20/Exa3_20.sce b/1697/CH3/EX3.20/Exa3_20.sce
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+//Exa 3.20
+clc;
+clear;
+close;
+//given data
+Gdb=44;//gain in dB
+G=10^(Gdb/10);//gain unitless
+OmegaB=4*%pi/G;//n steradian
+THETA3db=sqrt(4*OmegaB/%pi);//in Radian
+disp(THETA3db,"Beamwidth THETA3db in degree : ");
+//Note : Answer in the book is not accurate.
+\ No newline at end of file