/*Find's Circles area, circumfrence, given its radius*/
#include<iostream.h>
#include<math.h>

float circarea(float);	//Function calclates circles area given its radius
float circperi(float);	//Function calculates circles perimetar given its radius

int main()
{
float r;
cout<<"Radius : "; cin>>r;
cout<<"Area = "<<circarea(r)<<endl;
cout<<"Circumfrence = "<<circperi(r)<<endl;
return 0;
}

float circarea(float radius)
{
return M_PI*radius*radius;
}

float circperi(float radius)
{
return 2*M_PI*radius;
}