• http://www.mathplayground.com/area_perimeter.html - Has ruler to line up on shape to measure and calculater perimeter, checks answers
• http://www.funbrain.com/poly/index.html - Online game permimetter of shapes can check answers
• http://www.bgfl.org/bgfl/custom/resources_ftp/client_ftp/ks2/maths/perimeter_and_area/index.html - perimeter of 2D objects
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