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+// exa 3.12 Pg 72
+
+clc;clear;close;
+
+// Given Data
+sigma_w=60;// MPa
+F=10;// kN
+alfa=30;// degree
+
+FH=F*sind(alfa);// kN
+FV=F*cosd(alfa);// kN
+t=poly(0,'t');// mm
+A=t*t;// mm.sq.
+sigma_d=FV*10**3/A
+M=FV*10**3*120+FH*10**3*150;// N.mm
+I=t*(2*t)**3/12;// mm^4
+sigma_t=M*t/I;// N/mm.sq.
+// Tensile stress at A=sigma_d+sigma_t=sigma_w ...eqn(1)
+expr = sigma_d+sigma_t-sigma_w;// polynomial from above eqn.
+t=roots(numer(expr));// roots of the polynomial
+t=t(1);// mm // discarding -ve roots
+printf('\n value of t = %.1f mm',t)
+A=2*t**2;// mm.sq.
+printf('\n Area of cross-section of Hanger, A = %.f mm.sq.',A)
+// Note-Answer in the textbook is slighly wrong and cross section not calculated.