// sum 3-12
clc;
clear;
D=50;
t=1.25;
d=0.5;
n=1/d;
p=1.5;
siga=p*D/(4*t);
sigc=20.27;
sigw=sigc/0.31416;

  // printing data in scilab o/p window
  printf("sigw is %0.2f N/mm^2    ",sigw);