/* 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
{
{
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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