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diff --git a/3864/CH6/EX6.20/Ex6_20.sce b/3864/CH6/EX6.20/Ex6_20.sce
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+clear
+//
+//
+
+//Initilization of Variables
+
+T=2*10**6 //N-mm //Torque transmitted
+G=80*10**3 //N/mm**2 //Modulus of rigidity
+d1=40 //mm 
+d2=80 //mm
+r1=20 //mm
+r2=40 //mm
+L=2000 //mm //Length of shaft
+
+//Calculations
+
+//Angle of twist 
+theta=2*T*L*(r1**2+r1*r2+r2**2)*(3*%pi*G*r2**3*r1**3)**-1 //radians
+
+//If the shaft is treated as shaft of average Diameter
+d_avg=(d1+d2)*2**-1 //mm
+
+theta1=T*L*(G*%pi*32**-1*d_avg**4)**-1 //Radians
+
+//Percentage Error
+//Let Percentage Error be E
+X=theta-theta1
+E=(X*theta**-1)*100 
+
+//Result
+printf("Percentage Error is %0.3f",E)