(Display a Circle and Its Attributes) Write a program that displays a circle of random size and calculates and displays the area, radius, diameter and circumference. Use the following equations:...

and calculates and displays the area, radius, diameter and circumference. Use the following equations:

diameter =
2
× radius,
area =
π
× radius2,
circumference =
2
×
π
× radius. Use the constant

Math.PI for pi (π). All drawing should be done on a subclass of JPanel, and the results of the calculations should be displayed in a read-only JTextArea.