#include <stdio.h>
#include <math.h>
int main()
{
int t, n;
double d;
scanf("%d",&t);
while(t--)
{
scanf( "%lf %d",&d,&n);
if(n%2==0)
printf("%.3f %d\n",(acos(-1.0)*d)/n,n/2);
else
printf("%.3f %d\n",(acos(-1.0)*d)/n,n);
}
return 0;
}
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