A line segment connecting two nonadjacent vertices of a polygon is called a diagonal . Use the link below to verify this and gather more information.
http://wiki.answers.com/Q/A+line+segment+connectin...

A line segment joining two adjacent
http://www.chacha.com/question/whatisalinesegm...

A line segment in a polygon connecting any 2 nonconsecutive vertices is called a diagonal.
http://wiki.answers.com/Q/A+is+a+segment+that+conn...
