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// Import all required packages
import javax.swing.JOptionPane;

public class Stage3
{
public static void main(String[] args)
{
//Declare Variables
double gridSize =...

Let’s see how that would work with an annulus with outer radius 2 and inner radius
1.
Let’s place this annulus on a coordinate system (sort of like a map).
And now imagine a grid laid over the top...