Identifying angles subtended chords in a circle. Identifying angles subtended at the equal chords and derive the rider. Identifying perpendicular bisectors of chords and derive the rider. Identifying angles in alternate segments and derive the riders Solving problems on angles subtended by chords in a circle Solving problems on angles subtended by two equal chords at the center. Solving problems on perpendicular bisectors of chords. Solving problems on angles in alternate segments