#include<iostream.h>
#include<conio.h>
#define PI 3.14159
#define NEWLINE '\n'
void main()
{
float r, area;
clrscr();
cout<<NEWLINE<<"Enter the radius of circle: ";
cin>>r;
area = 2*PI*r;
cout<<NEWLINE<<"Area of circle is: "<<area;
getch();
}
Zaarm Tech Selected answer as best November 20, 2021
