Equations of a Circle, C++ (gcc)

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// Equations of a Circle
#include <iostream>
using namespace std;

const double pi = 3.14159;
const char newline = '\n';

int main ()
{
    double r=25;                // double r=(insert specified radius here);
    double Circumference;
    double d=2*r;
    double Area;
    
    cout << "Please do not mess with any of the functions or what I have written.";
    cout << '\n';
    cout << "r = "; cout << r; cout << " cm";
    cout << '\n';
    cout << "d = "; cout << d; cout << " cm";
    cout << '\n';
    Circumference = 2*pi*r;     // The actual equation for circumference.
    cout << "Circumference = "; cout << Circumference;      // Prints the answer.
    cout << " cm";
    cout << '\n';
    Circumference = pi*d;       // The actual equation for circumference again.
    cout << "Circumference = "; cout << Circumference;      // Prints the answer again.
    cout << " cm";
    cout << '\n';
    Area = 2*pi*(r*r);          // The actual equation for area of a circle.
    cout << "Area = "; cout << Area;               // Prints the answer again.
    cout << " cm^2";
    cout << '\n';
}

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Compilation time: 0.32 sec, absolute running time: 0.14 sec, cpu time: 0 sec, memory peak: 3 Mb, absolute service time: 0.48 sec