Solutions of Circle

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Write solution here.

orz_qbl    Created at    3 likes

#include <bits/stdc++.h>
#define pi 3.14
double r;
using namespace std;
int main(){
    cin >> r;
    cout << fixed << setprecision(3) << 2*pi*r << " " << pi*r*r << endl;
    return 0;
}