what do u mean by 'angles in the same segment'.My teacher explained a sum using this property.But I couldn't understand.PLs explain me with suitable diagram.
http://www.mathsteacher.com.au/year10/ch06_geometry/09_angles_same_segment/segment.htm
http://www.mathsteacher.com.au/year10/ch06_geometry/09_angles_same_segment/segment.htm