Java :

import java.util.Scanner;


public class Main {
 public static void main(String[] args)
 {
	 Scanner cin=new Scanner(System.in);
	 int N=cin.nextInt();long[][] tt=new long[N][8];
	 for(int i=0;i<N;i++)
	 {
		 tt[i][0]=cin.nextInt();
		 tt[i][1]=cin.nextInt();
		 tt[i][2]=cin.nextInt();
		 tt[i][3]=cin.nextInt();
		 
		 tt[i][4]=cin.nextInt();
		 tt[i][5]=cin.nextInt();
		 tt[i][6]=cin.nextInt();
		 tt[i][7]=cin.nextInt();
	 }
	 for(int i=0;i<N;i++)
	 {
		 long ax1=tt[i][0];
		 long ay1=tt[i][1];

		 
		 long bx1=tt[i][2];
		 long by1=tt[i][3];
		 
		 long ax2=tt[i][4];
		 long ay2=tt[i][5];
		 
		 long bx2=tt[i][6];
		 long by2=tt[i][7];
		 
		 long minax,minay,maxax,maxay,minbx,minby,maxbx,maxby;
		 long subx1,subx2,subx,suby1,suby2,suby;
		 if(ax1>ax2)
		 {
			 maxax=ax1;
			 minax=ax2;
		 }
		 else
		 {
			 maxax=ax2;
			 minax=ax1;
		 }
		 if(ay1>ay2)
		 {
			 maxay=ay1;
			 minay=ay2;
		 }
		 else
		 {
			 maxay=ay2;
			 minay=ay1;
		 }
		 
		 if(bx1>bx2)
		 {
			 maxbx=bx1;
			 minbx=bx2;
		 }
		 else
		 {
			 maxbx=bx2;
			 minbx=bx1;
		 }
		 
		 if(by1>by2)
		 {
			 maxby=by1;
			 minby=by2;
		 }
		 else
		 {
			 maxby=by2;
			 minby=by1;
		 }
		 
		 if(maxax<=minbx||minax>=maxbx||maxay<=minby||minay>=maxby)
		 {
			 System.out.println(Math.abs(ax2-ax1)*Math.abs(ay2-ay1)+Math.abs(bx2-bx1)*Math.abs(by2-by1));
		 }
		 else
		 {
			 if(minax>=minbx&&maxax<=maxbx)
			 {
				 subx=Math.abs(ax2-ax1);
			 }
			 else if(minbx>=minax&&maxbx<=maxax)
			 {
				 subx=Math.abs(bx2-bx1);
			 }
			 else
			 {
			 
			 subx1=Math.abs(maxax-minbx);
			 subx2=Math.abs(maxbx-minax);
			 if(subx1<subx2)
			 {
				 subx=subx1;
			 }
			 else
			 {
				 subx=subx2;
			 }
			 }
			 
			 
			 if(minay>=minby&&maxay<=maxby)
			 {
				 suby=Math.abs(ay2-ay1);
			 }
			 else if(minby>=minay&&maxby<=maxay)
			 {
				 suby=Math.abs(by2-by1);
			 }
			 else{
			 
			 
			 suby1=Math.abs(maxay-minby);
			 suby2=Math.abs(maxby-minay);
			 if(suby1<suby2)
			 {
				 suby=suby1;
			 }
			 else
			 {
				 suby=suby2;
			 }
			 }
			 System.out.println(Math.abs(ax2-ax1)*Math.abs(ay2-ay1)+Math.abs(bx2-bx1)*Math.abs(by2-by1)-subx*suby);
		 }
	
	 }
 }
}