http://www.mathplayground.com/PartyDesigner/PartyDesigner.html
http://www.mathplayground.com/area_perimeter.html
http://www.mathplayground.com/howto_area_triangle.html
http://www.ixl.com/math/grade-5/area-of-triangles
http://www.sheppardsoftware.com/mathgames/geometry/shapeshoot/AreaShapesShoot.htm
http://www.mathplayground.com/area_perimeter.html
http://www.mathplayground.com/PartyDesigner/PartyDesigner.html
http://www.factmonster.com/math/knowledgebox/player.html?movie=sfw41552
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