using namespace std;
#include <iostream>
#include <string>
#include <cmath>

int main() {

    double r, n, k;
    cin >> r >> n >> k;
    while (n != 0) {
        double ePI = k/n*4;
        cout << atan(1)*4*r*r << " " << r*r*ePI << endl;
        cin >> r >> n >> k;
    }
    return 0;
}