Area and Perimeter

http://www.sheppardsoftware.com/mathgames/geometry/shapeshoot/PerimeterShapesShoot.htm

http://www.sheppardsoftware.com/mathgames/geometry/shapeshoot/AreaShapesShoot.htm

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

http://www.bgfl.org/bgfl/custom/resources_ftp/client_ftp/ks2/maths/perimeter_and_area/index.html