http://www.macomb.k12.mi.us/wq/ed/CCarol.htm
http://www.shodor.org/interactivate/dictionary/s.html#square
http://www.math.com/school/subject3/lessons/S3U2L3GL.html
http://www.shodor.org/interactivate/discussions/rectangle.html
http://www.mathgoodies.com/lessons/vol1/perimeter.html
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