The section “Abstract Classes” gives a version of the abstract class Equidistantshape that contains a private data field radius.
a. Define a class of circles as a subclass of Equidistantshape. Include additional methods for diameter and circumference.
b. Revise the abstract class Equidistantshape so that radius is a protected data field instead of a private data field. Which mediods are abstract and which methods must you implement?
c. Repeat Part a, assuming the revision you made in Partb.
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