#include<stdio.h>
#include<math.h>
int main ()
{

    double  a,n, area, theta, radius,p, pi=3.1416;
    scanf("%lf %lf", &n, &a);
    theta=180/n;
    p=sin(theta);
    printf("%lf\n",p);
    radius=a/(2*p);
    printf("%lf\n", radius);
    area=pi*radius*radius;
    printf("%lf\n", area);
    return 0;
}