#include <stdio.h>
//File: circumfrance of a circle.

/*
Write a program that finds the circumfrance of any circle.
Use the formula circumfrance=2*pi*radius.

/*

void main() {
    
    double Circumfrance ;
    double pi=3.14;
    double radius=3958.8;
    
Circumfrance=2*pi*radius;

printf("The  Circumfrance of your circle is %.2lf miles\n", Circumfrance);

}