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#include <iostream>
#include <iomanip>
#include <cmath>
using namespace std;
const float PI = 3.1416;
//Prototypes declaration
double distance (double, double, double, double);
double radius (double, double, double, double);
double circumference (double);
double area (double);
//Main Function
int main()
{
double x1, x2, y1, y2;
//Get a center point
cout << "Enter center of circle: ";
cin >> x1 >> y1;
//Get another point on the circle
cout<<"Enter a point on circle: ";
cin >> x2 >> y2;
cout << radius (x1, y1, x2, y2);
cout << circumference (radius);
cout << area (radius);
return 0;
}
double distance (double x1, double y1, double x2, double y2)
{
double radius = sqrt(pow(x2 - x1 , 2.0)
+ pow(y2 - y1, 2.0));
return radius;
}
double radius (double x1, double y1, double x2, double y2)
{
double radius = distance (x1, y1, x2, y2);
return radius;
}
double circumference (double radius)
{
double circumference = PI * (radius * 2);
return circumference;
}
double area(double radius)
{
double area = PI * radius * radius;
return area;
}
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