language: C99 strict (gcc-4.3.4)
date: 107 days 15 hours ago
link:
visibility: public 
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#include <stdio.h>
#include <float.h>
#include <math.h>
 
#define PI 3.141592654
 
int
main(void)
{
  double r, d, w;
  scanf("%lf %lf", &r, &d);
  printf("%lf %lf\n", r, d);
  w = sqrt(r*r - d*d/4);
  w = PI * w * w;
  printf("%.2lf\n", w);
  return 0;
}