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OI-codes/Luogu/P4326/P4326.cpp

13 lines
204 B
C++

#include <bits/stdc++.h>
using namespace std;
const double pi = 3.14159265358979323;
int main() {
int r;
scanf("%d", &r);
printf("%.6lf\n%.6lf\n", r * r * pi, r * r * 2.0);
return 0;
}