Please solve using C++ A friend function is a function that is not a member of a class, but has access to privato members of the class. A friend function can be a stand-alone tun ction or a member function of another class. This task demonstrates examples of friend stand-alone functions. Write the definition of a class named Circle that has the followings: A private data member radius of type double. A default constructor that assigns the value 1 to radius. A friend function named setRadius that accepts a Circle object by reference as first argument, and a double as second argument then assigns it to the radius of the Circle argument. A friend function named getArea that accepts a Circle as an argument, then uses the radius of that argument to calculate its area and return it. Use 3, 14159 as an approximate value of PI (m)