http://interactivesites.weebly.com/areaperimeter.html
http://www.mathplayground.com/area_perimeter.html
http://www.funbrain.com/poly/
http://www.bgfl.org/bgfl/custom/resources_ftp/client_ftp/ks2/maths/perimeter_and_area/index.html
http://mathszone.co.uk/measuring/area-and-perimeter/
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