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diff --git a/src/geometry.h b/src/geometry.h
index 6ff4564..d19d48c 100644
--- a/src/geometry.h
+++ b/src/geometry.h
@@ -3,6 +3,10 @@
 
 #include "vector.h"
 
+class Circle;
+class Dimension;
+class Line;
+
 class Geometry
 {
 	public:
@@ -11,6 +15,10 @@ class Geometry
 		static double ParameterOfLineAndPoint(Point, Point, Point);
 		static Point MirrorPointAroundLine(Point, Point, Point);
 		static Point RotatePointAroundPoint(Point, Point, double);
+		static double Determinant(Point, Point);
+		static int Intersects(Line *, Line *, double * tp = 0, double * up = 0);
+		static int Intersects(Line *, Dimension *, double * tp = 0, double * up = 0);
+		static int Intersects(Line * l, Circle * c, double * tp = 0, double * up = 0, double * vp = 0, double * wp = 0);
 };
 
 #endif 	// __GEOMETRY_H__