#include <iostream>
int calculateArea(int side) {
 return side * side;
}
int calculateArea(int length, int width) {
 return length * width;
}
double calculateArea(double radius) {
 constexpr double PI = 3.141592653589793;
 return PI * radius * radius;
}
int main() {
 std::cout << "Square Area: " << calculateArea(5) << '\n';
 std::cout << "Rectangle Area: " << calculateArea(6, 3) << '\n';
 std::cout << "Circle Area: " << calculateArea(20.0) << '\n';
 return 0;
}