/**
 * <p>Title: </p>
 *
 * <p>Description: </p>
 *
 * <p>Copyright: Copyright (c) 2005</p>
 *
 * <p>Company: </p>
 *
 * @author not attributable
 * @version 1.0
 */

import java.io.*;
import java.lang.*;
import java.util.*;



public class castles {
    public static void main(String[] args) {
        try
        {
            FileReader fr = new FileReader("castles.in");
            BufferedReader br = new BufferedReader(fr);

            String input = br.readLine();

            // number of data sets
            int numSets = Integer.parseInt(input);
            // read in the data sets
            for (int i = 0; i < numSets; i++)
            {
                double w, h, m, d;
                int b;

                input = br.readLine();
                String[] tokens = input.split("\\s");

                w = Double.parseDouble(tokens[0]);
                h = Double.parseDouble(tokens[1]);
                m = Double.parseDouble(tokens[2]);
                d = Double.parseDouble(tokens[3]);
                b = Integer.parseInt(tokens[4]);

                // total area of the base
                double baseArea = (h - 2.0*m)*(w-2.0*m);

                // calculate moat
                double moatArea = w*h - (h - 2.0*m)*(w-2.0*m);

                double totalArea = w*h;


                double totalVolumeForBuildings = 0.0;

                // read in the buildings
                for (int k = 0; k < b; k++)
                {
                    String buildingsRaw = br.readLine();
                    String[] buildings = buildingsRaw.split("\\s");

                    double buildH = Double.parseDouble(buildings[0]);
                    double buildR = Double.parseDouble(buildings[1]);

                    // Volume = Pi*R^2*h
                    double volume = Math.PI * buildR * buildR * buildH;

                    // add to the total area
                    totalVolumeForBuildings += volume;

                   // System.out.println("H: " + buildH + " R: " + buildR + " volume: " + volume + " total: " + totalVolumeForBuildings);

                }

                // calculate the other stuff



                // calculates the distance required to build the buildings
                double x = totalVolumeForBuildings / totalArea;

                // so if moat is 0, consider the whole thing a moat
                if (m == 0)
                {
                 moatArea = baseArea;
                 baseArea = 0;
                }

                double Moatdelta = (d) * (moatArea) / (baseArea + moatArea);

                double finalDelta = 0 - x + Moatdelta;

                double delta = finalDelta;

                // Display the output
                System.out.println("Data Set " + (i+1) + ":");
                if (delta%(int)delta == 0)
                    System.out.println((new java.text.DecimalFormat("#.##")).format(delta)+".00");
                else
                    System.out.println((new java.text.DecimalFormat("#.##")).format(delta));

            }



        }
        catch (Exception e)
        {

        }

    }
}