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#include <iostream>
#include <fstream>
using namespace std;

int main()
{
	setlocale(LC_ALL, "Russian");
	ifstream in("input.txt");
	pair <float, float > a;
	pair <float, float> b;
	pair<float, float> c;
	pair<float, float> d;
	float A, B, P, S,Cx,Cy;
	in >> a.first >> a.second >> b.first >> b.second >> c.first >> c.second >> d.first >> d.second;
	A = a.first - b.first + 2;
	B = a.second - b.second + 2;
	P = 2 * (A + B);
	S = A * B;
	Cx = (a.first + b.first) / 2;
	Cy = (a.second + d.second) / 2;
	cout << "ПЕРИМЕТР - " << P << ' ' << "ПЛОЩАДЬ - " << S << ' ' << "Центр тяжести x и y - " <<  Cx << ' ' << Cy;
}