小狐狸的X · 发布于 2022-10-21 · 浏览 738 回复 0

//freopen("1109.in","r",stdin);
//freopen("1109.out","w",stdout);
double r,d,C,S;
scanf("%lf",&r);
d=r*2;
C=d*3.1415926;
S=r*r*3.1415926;
printf("%.4lf %.4lf %.4lf",d,C,S);
return 0;