oppositeAngle     254 modules/imgproc/src/min_enclosing_triangle.cpp static double oppositeAngle(double angle);
oppositeAngle    1165 modules/imgproc/src/min_enclosing_triangle.cpp         angleFlushEdge = oppositeAngle(angleFlushEdge);
oppositeAngle    1236 modules/imgproc/src/min_enclosing_triangle.cpp     double angle1Opposite = oppositeAngle(angle1);