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diff --git a/src/geometry.h b/src/geometry.h
index 8936088..410c7e0 100644
--- a/src/geometry.h
+++ b/src/geometry.h
@@ -3,8 +3,9 @@
 
 #include "vector.h"
 
-class Line;
 class Circle;
+class Dimension;
+class Line;
 
 class Geometry
 {
@@ -16,7 +17,10 @@ class Geometry
 		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);
+		static int Intersects(Circle * c1, Circle * c2, double * tp = 0, double * up = 0, double * vp = 0, double * wp = 0, Point * p1 = 0, Point * p2 = 0);
+		static void FindAnglesForSides(double s1, double s2, double s3, double * a1, double * a2, double * a3);
 };
 
 #endif 	// __GEOMETRY_H__