c++ - overloading friend operator >> for template class - Stack Overflow

How do I get the user to assign the value to radius using the overloaded friend operator>>? I have no idea why I am getting this error. Only when I explicitly assign a value to r in the Circle

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C++ Overloading Operator<< By Using Static Helper Methods Creating Access Violation Error - Stack Overflow

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C++ Fractions Class - Stack Overflow