#include <iostream>
#include <cmath>
using namespace std;
void f(int a, double& square, double& circlelength){
square=2*M_PI*a;
circlelength=M_PI*a*a;
}
int main() {
double r, s=0, l=0;
cin>>r;
f(r, s, l);
cout<<"Площа: "<<s<<endl<<"Довжина: "<<l;
return 0;
}
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