angle.cpp

#include <bits/stdc++.h>
using namespace std;

signed main() {
  cin.tie(0)->sync_with_stdio(0);
  int T; cin >> T;
  while (T--) {
    vector<pair<int,int>> a(4);
    for (int i = 0; i < 4; i++) {
      cin >> a[i].first >> a[i].second;
    }
    vector<pair<int,int>> vec(4);
    for (int i = 0; i < 4; i++) {
      vec[i].first  = a[i].first  - a[(i + 1) % 4].first;
      vec[i].second = a[i].second - a[(i + 1) % 4].second;
    }
    int ans = 0;
    for (int i = 0; i < 4; i++) {
      if (vec[i].first * vec[(i + 1) % 4].first + vec[i].second * vec[(i + 1) % 4].second == 0) {
        ans++;
      }
    }
    cout << ans << '\n';
  }
}