#include <iostream>

#include <cmath>

using namespace std;

 bool isTriangle(pair<int, int> A, pair<int, int> B, pair<int, int> C) {

int x1 = A.first, y1 = A.second; int x2 = B.first, y2 = B.second; int x3 = C.first, y3 = C.second;

float area = 0.5 * abs(x1 * (y2 - y3) + x2 * (y3 - y1) + x3 * (y1 - y2));

 return area != 0;

}

int main() {

pair<int, int> A = {1, 2};

pair<int, int> B = {4, 6};

pair<int, int> C = {5, 8};

if (isTriangle(A, B, C)) {

cout << "Ba diem A, B, C tao thanh mot tam giac." << endl; } else {

cout << "Ba diem A, B, C khong tao thanh mot tam giac." << endl;

}

return 0;

}