Question: 4. Write a program that computes the area of a circular region (the shaded area in the diagram) given the radii of the inner

4. Write a program that computes the area of a circular region (the shaded area in the diagram) given the radii of the inner and the outer circles, r; and ro, respectively. We compute the area of the circular region by subtracting the area of the inner circle from the area of the outer circle. Define a Circle class that has methods to compute the area and circumference. You set the circle's radius with the setRadius method or via a constructor.

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