#include using namespace std; pair p1,p2,p3; // point pair v1, v2; // vector int main() { ios::sync_with_stdio(false); cin.tie(0); cin >> p1.first >> p1.second >> p2.first >> p2.second >> p3.first >> p3.second; v1.first = p2.first - p1.first; v1.second = p2.second - p1.second; v2.first = p3.first - p2.first; v2.second = p3.second - p2.second; // sin(theta) = |v1 x v2| / |v1||v2|, +면 -1, -면 1, 0이..