C++ :

#include <iostream> 
#include <cstdio>
using namespace std;
int main()
{
	double r;
	double s,l;
	cin>>r;
	l=2*3.1415*r;
	s=3.1415*r*r;
	printf("%.2lf\n",l);
	printf("%.2lf\n",s);
	// printf("%.2lf\n",l);
	return 0;
}

Pascal :

const
  pi=3.1415;
var
c,s,r:real;
begin
read(r);
c:=2*pi*r;
s:=pi*sqr(r);
writeln(c:0:2); 
writeln(s:0:2);
end.