Circle.
http://wiki.answers.com/Q/What_is_a_closed_figure_...

polygon.it could be a triangle a square or whatever.as long as it is made of line segments.circles dont belong here.
http://answers.yahoo.com/question/index?qid=200805...

A pentagon is a closed figure made up of line segments
http://www.chacha.com/question/whatisaaclosed...

polygon  polygon closed plane figure bounded by straight line segments as sides. A polygon is convex if any two points inside the polygon can be connected by a line segment that
http://www.tutorvista.com/ks/whatisaclosedplan...
