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diff --git a/3774/CH3/EX3.3/Ex3_3.sce b/3774/CH3/EX3.3/Ex3_3.sce
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+// exa 3.3 Pg 64
+
+clc;clear;close;
+
+// Given Data
+P=20;// kN
+Sut=300;// MPa
+n=3;// factor of safety
+
+sigma_w=Sut/n;// MPa (Working stress for the link)
+
+t=poly(0,'t');// thickness of link
+A=4*t*t;// mm.sq. 
+sigma_d=P*10**3/A;// N/mm.sq.
+e=6*t;//mm
+M=P*10**3*e;// N.mm
+z=t*(4*t)**2/6;// mm^3 (section modulus at x1-x2)
+sigma_b=M/z;// N/mm.sq.
+//maximum tensile stress at x1 = sigma_d+sigma_b=sigma_w  ...eqn(1)
+expr=sigma_d+sigma_b-sigma_w ;// expression of polynomial from above eqn.
+t=roots(numer(expr));// solving the equation (as denominator will me be multiplied by zero on R.H.S)
+t=t(2);// mm // discarding -ve roots
+printf('dimension of cross section of link, t=%.2f mm. Use 23 mm.',t)