This shows two circles, which are the same size. The 1st is divided into 12 equally sized segments. The 2nd is divided into 12 equally divided segments as well but the 1st segment has been divided into two, to create two half segments. The segments are numbered from 1 to 13.
Under the circles the segments are shown fitted together to form a rectangular like shape. The two half segments form the ends of the rectangle and circular edges of the segments the top and bottom of the rectangle. Next to this a rectangle has been drawn around this same shape formed by the segments. Each segment again is numbered from 1 to 13.