Final answer:
When you run this code segment, a new Circle object will be created and its string representation will be printed on the console.
Step-by-step explanation:
When the code segment Circle c = new Circle(); System.out.println(c); is run, a new object of the Circle class is created and assigned to the variable c. The System.out.println(c) statement prints the string representation of the c object on the console. The string representation of the c object depends on how the Circle class has defined its toString() method.