http://www.mathplayground.com/area_perimeter.html
http://www.bgfl.org/custom/resources_ftp/client_ftp/ks2/maths/perimeter_and_area/index.html
http://www.funbrain.com/poly/
http://www.sheppardsoftware.com/mathgames/geometry/shapeshoot/PerimeterShapesShoot.htm
http://www.shodor.org/interactivate/activities/PerimeterExplorer/
http://www.factmonster.com/math/knowledgebox/player.html?movie=sfw41374
http://www.softschools.com/math/geometry/perimeter_game.jsp
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