/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		Scanner in = new Scanner (System.in);
		int n = in.nextInt();
		for (int i = 0; i < n; i++) {
			int x = in.nextInt();
			int y = in.nextInt();
			int z = in.nextInt();
			int r = in.nextInt();
			int a = in.nextInt();
			int b = in.nextInt();
			int c = in.nextInt();
			int d = in.nextInt();
 
			System.out.printf("%.9f"  + "\n", r * r * Math.PI);
		}
	}
}

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MgoyIDMgNSA3IDEgMiA0IDgKNCA1IDMgOSAyIDYgOCAxMA==

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