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Apr 26th, 2018
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  1.  
  2. #include<stdio.h>
  3. #include<math.h>
  4. #include<stdlib.h>
  5. int main()
  6. {
  7. int i;
  8. double a,b,c,d,s,h,j,n,Area;
  9. scanf("%lf",&n);
  10. for(i=1;i<=n;i++)
  11. {
  12. scanf("%lf%lf%lf%lf",&a,&b,&c,&d);
  13. j=abs(c-a);
  14. s=(b+d+j)/2;
  15. h=abs(2*(sqrt(s*(s-j)*(s-b)*(s-d)))/j);
  16. Area=((a+c)/2)*h;
  17. printf("Case %d: %lf\n",i,Area);
  18.  
  19.  
  20. }
  21. }
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