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Sep 15th, 2019
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  1. #include<stdio.h>
  2. int main()
  3. {
  4.    int i,T;
  5.    scanf("%d",&T);
  6.    if(T<=100)
  7.    {
  8.       for(i=1;i<=T;i++)
  9.       {
  10.         double area1,area2,r,area,pI=3.1416;
  11.         scanf("lf",&r);
  12.         area1=( 4*r*r)
  13.         area2=(pI*r*r);
  14.         area=area1-area2;
  15.  
  16.        printf("case %d : %.4lf",i,area);
  17.  
  18.  
  19.  
  20.       }
  21.  
  22.  
  23.  
  24.    }
  25.  
  26.  
  27.  
  28.  
  29.  
  30.  
  31. }
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