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diff --git a/src/vector.cpp b/src/vector.cpp
old mode 100755
new mode 100644
index fe627cd..baa0422
--- a/src/vector.cpp
+++ b/src/vector.cpp
@@ -162,11 +162,7 @@ void vector::zero(const double epsilon/*= 1.0e-6*/)
 #include "vector.h"
 
 #include <math.h>								// For sqrt()
-//#include "mathconstants.h"
-
-#define PI 3.14159265358979323846264338327
-#define RADIANS_TO_DEGREES (180.0 / PI)
-#define DEGREES_TO_RADIANS (PI / 180.0)
+#include "mathconstants.h"
 
 
 // Vector implementation
@@ -354,11 +350,11 @@ double Vector::Magnitude(void)
 
 double Vector::Angle(void)
 {
-	// acos returns a value between zero and PI, which means we don't know which
-	// quadrant the angle is in... Though, if the y-coordinate of the vector is
-	// negative, that means that the angle is in quadrants III - IV.
+	// acos returns a value between zero and PI, which means we don't know
+	// which quadrant the angle is in... Though, if the y-coordinate of the
+	// vector is negative, that means that the angle is in quadrants III - IV.
 	double rawAngle = acos(Unit().x);
-	double correctedAngle = (y < 0 ? (2.0 * PI) - rawAngle : rawAngle);
+	double correctedAngle = (y < 0 ? TAU - rawAngle : rawAngle);
 
 	return correctedAngle;
 }