#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;
double radius= 3958.8 ;

circumfrance=2*pi*radius;

printf("The circumfrance of your circle is %. 2lf miles/n", circumfrance 

}