1. #include <stdio.h> int main() { int r; scanf("%d",&r); printf("%.2f %.2f",23.1415926535r,rr3.1415926535); return 0; }

#include<stdio.h> #define PI 3.1415926 int main() { int R; scanf("%d",&R); double s=PIRR; double c=2PIR; printf("%.2f %.2f",s,c); return 0; }

include<iostream>
using namespace std;
#include<iomanip>
#include <cstdio>
	int main(){
	const	double p1=3.1415926;
	double r;
	cin>>r;
	cout<<fixed<<setprecision(2)<<2*p1*r<<" "<<p1*r*r<<endl;
return 0;
}

#include<stdio.h> int main() { int r = 0; scanf("%d", &r); printf("%.2f %.2f", 3.1415926* 2 * r, 3.1415926 * r * r);

return 0;

}