// using * saves typing
import java.util.*; 
import java.io.*;

public class Point2Line
{
    public static void main(String[] args)
    {
	// in and out can be typed faster than input and output
	Scanner in = new Scanner(System.in); 
	PrintStream out = System.out;

	// n is a constant but typing final takes type
	int n = in.nextInt(); 
	// read the end of line
	in.nextLine();
	for (int i = 0; i < n; i++)
	{
	    // process input
	    int x1 = in.nextInt();
	    int y1 = in.nextInt();
	    int A = in.nextInt();
	    int B = in.nextInt();
	    int C = in.nextInt();
	    // read the end of line
	    in.nextLine();

	    // compute distance using the formula given in the question
	    double distance = Math.abs((A * x1 + B * y1 + C) / Math.sqrt(A * A + B * B));

	    // print the distance (make sure that you match the output exactly)
	    out.printf("Case %d: The distance is %.2f.%n", i + 1, distance);
	}
    }
}