diff --git a/Utility.h b/Utility.h
index bf07aab..3565ba6 100644
--- a/Utility.h
+++ b/Utility.h
@@ -1,6 +1,11 @@
 #pragma once
 #ifndef UTILITY_H
 
+static float sign(float x1, float y1, float x2, float y2, float x3, float y3)
+{
+    return (x1 - x3) * (y2 - y3) - (x2 - x3) * (y1 - y3);
+}
+
 static float sign (Point &p1, Point &p2, Point &p3)
 {
     return (p1.x() - p3.x()) * (p2.y() - p3.y()) - (p2.x() - p3.x()) * (p1.y() - p3.y());