Mental math check whether following figure. Please answer with explanation so that it can be understood

Figure. Order of rotation. Angle of rotation (a). 2. 180 degree. (c). 2. 180 degree (f). 2. 180 degree. (g). 2. 180 deg. (h). 2. 180 deg. (i). 2. 180 deg. (j). 2. 180 deg. Other figures have no rotational symmetry