identify lines of symmetry in two-dimensional geometric figures.

http://www.beaconlearningcenter.com/WebLessons/AskHannah/beacon002.htm

http://www.innovationslearning.co.uk/subjects/maths/activities/year3/symmetry/shape_game.asp

http://pbskids.org/cyberchase/games/symmetry/

http://www.adrianbruce.com/Symmetry/index.html

http://www.studyzone.org/mtestprep/math8/f/symmetry5l.cfm

http://www.mathplayground.com/Perfectly_Symmetrical.html