#include <iostream>
#include <math.h>
#include <stdlib.h>
#include <cmath>
using namespace std;
int main()
{
system(" COLOR FC");
float circumference_of_circle_radius,radius ;
cout << " Insert the radius of the circle: \n";
cin >> radius ;
circumference_of_circle_radius = 2*(22/7)*radius;
cout << fixed ;
cout .precision(3);
cout << "circumference_of_circle_radius = "<<circumference_of_circle_radius << endl;
return 0;
}
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