#include <iostream>
#include <cmath> // for M_PI constant
using namespace std;
int main() {
float radius, area;
cout << "Enter the radius of the circle: ";
cin >> radius;
// Use M_PI from cmath for a more precise value
area = M_PI * pow(radius, 2.0);
cout << "Area of the circle with radius " << radius << " is " << area << endl;
return 0;
}
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