#include <iostream>
#include <cmath>
using namespace std;
#define pi 3.1415926
int main()
{
double r;
cout<<"Enter the radius of circle: ";
cin>>r;
cout<<endl;
cout<<"The area of circle is: "<<pi*pow(r,2)<<endl;
cout<<"The perimiter of circle is: "<<2*pi*r<<endl;