Finds angle between three points. :param p1: Point1 - (x1,y1) :param p2: Point2 - (x2,y2) :param p3: Point3 - (x3,y3) :param img: Image to draw output on. If no image input output img is None :return:
(self,p1, p2, p3, img=None, color=(255, 0, 255), scale=5)
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