Submit Time:2024-03-24 12:55:47

运行 ID: 43966

#include<bits/stdc++.h> using namespace std; int main() { double r,d,c,s; cin>>r; d=2*r; c=2*3.14159*r; s=3.14159*r*r; printf("%.4lf ",d); printf("%.4lf ",c); printf("%.4lf",s); return 0; }