#include <bits/stdc++.h>
using namespace std;
using ll = long long;
#define rep(i, n) for (int i = 0; i < (int)(n); i++)

tuple<ll, ll, ll, ll> calc(ll x1, ll y1, ll x2, ll y2, ll x3, ll y3) {
  ll p1 = (x1 * x1 + y1 * y1) * (y2 - y3) + (x2 * x2 + y2 * y2) * (y3 - y1) +
          (x3 * x3 + y3 * y3) * (y1 - y2);
  ll p2 = (x1 - x2) * (y2 - y3) - (x2 * x3) * (y1 - y2);
  ll q1 = (x1 * x1 + y1 * y1) * (x2 - x3) + (x2 * x2 + y2 * y2) * (x3 - x1) +
          (x3 * x3 + y3 * y3) * (x1 - x2);
  ll q2 = (y1 - y2) * (x2 - x3) - (y2 * y3) * (x1 - x2);
  ll gp = __gcd(p1, p2), gq = __gcd(q1, q2);
  return {p1 / gp, p2 / gp, q1 / gq, q2 / gq};
}

void solve() {
  vector<ll> xs(4), ys(4);
  rep(i, 4) cin >> xs[i] >> ys[i];
  set<tuple<ll, ll, ll, ll>> st;
  rep(i, 4) {
    rep(j, 3) {
      ll i0 = (i + j) % 4;
      ll i1 = (i + j + 1) % 4;
      ll i2 = (i + j + 2) % 4;
      st.insert(calc(xs[i0], ys[i0], xs[i1], ys[i1], xs[i2], ys[i2]));
    }
  }
  cout << (st.size() == 1 ? "YES" : "NO") << '\n';
}

int main() {
  std::cin.tie(nullptr);
  std::ios_base::sync_with_stdio(false);
  int T = 1;
  for (int t = 0; t < T; t++) {
    solve();
  }
  return 0;
}