(a:Point2, b:Point2, c:Point2)
return direction
Return LEFT_DIR if angle abc is a turn to the left, otherwise RIGHT_DIR
    Returns RIGHT_DIR if ab and bc are colinear
Return LEFT_DIR if angle abc is a turn to the left, otherwise RIGHT_DIR
    Returns RIGHT_DIR if ab and bc are colinear
Return LEFT_DIR if angle abc is a turn to the left otherwise RIGHT_DIR Returns RIGHT_DIR if ab and bc are colinear
def direction_of_bend(a:Point2, b:Point2, c:Point2) -> DirectionLR:
    """ 
    Return LEFT_DIR if angle abc is a turn to the left, otherwise RIGHT_DIR
    Returns RIGHT_DIR if ab and bc are colinear
    """
    direction = LEFT_DIR if cross_2d(b-a, c-b) > 0 else RIGHT_DIR
    return direction
def direction_of_bend ( a : Point2 , b : Point2 , c : Point2 ) -> DirectionLR : direction = LEFT_DIR if cross_2d ( b - a , c - b ) > 0 else RIGHT_DIR return direction