def qtdCam (x1,x2,y1,y2):
if x1 == y1 or x2 == y2:
return 1
aux = qtdCam(x1+1, x2,y1, y2)
return aux + qtdCam(x1,x2+1,y1,y2)
qtd = int(input())
ret = 0
for i in range(qtd):
let = input().split()
x1 = let[0]
x2 = let[1]
y1 = let[2]
y2 = let[3]
a = (int(y1)-int(x1))*(int(y2)-int(x2)) + 1
print(a)
// Online C++ compiler to run C++ program online
#include <bits/stdc++.h>
using namespace std;
int main() {
int t;
cin>>t;
while(t--){
long long x1 , y1 , x2 , y2;
cin>>x1>>y1>>x2>>y2;
long long ans = (x2 - x1) * (y2 - y1) + 1;
cout<<ans<<endl;
}
return 0;
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