#include<stdio.h>
#include<math.h>
int main()
{
double r,result;
int tc,cn;
scanf("%d",&tc);
for(cn=1;cn<=tc;cn++)
{
scanf("%lf",&r);
result = (4*r*r - (2*acos(0.0)*r*r));
printf("Case %d: %.2f\n",cn,result+10e-9);
}
return 0;
}
#include<math.h>
int main()
{
double r,result;
int tc,cn;
scanf("%d",&tc);
for(cn=1;cn<=tc;cn++)
{
scanf("%lf",&r);
result = (4*r*r - (2*acos(0.0)*r*r));
printf("Case %d: %.2f\n",cn,result+10e-9);
}
return 0;
}
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