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diff --git a/src/vector.h b/src/vector.h
index c1cee7d..81a715f 100644
--- a/src/vector.h
+++ b/src/vector.h
@@ -16,6 +16,7 @@ class Vector
 {
 	public:
 		Vector(double xx = 0, double yy = 0, double zz = 0);
+		Vector(Vector head, Vector tail);		// Create vector from two points
 		Vector operator=(Vector const v);
 		Vector operator+(Vector const v);
 		Vector operator-(Vector const v);
@@ -40,6 +41,7 @@ class Vector
 		// Class methods
 
 		static double Dot(Vector v1, Vector v2);
+		static double Magnitude(Vector v1, Vector v2);
 
 	public:
 		double x, y, z;