+ 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);