Area
The area of a shape is the amount inside it.
http://www.authorstream.com/area-ppt-powerpoint
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http://www.mathleague.com/help/geometry/area.htm
http://www.math.com/tables/geometry/areas.htm
http://www.mathsisfun.com/area.html
http://www.onlinemathlearning.com/area-formula.html
http://math2.org/math/geometry/areasvols.htm
http://schools.cfisd.net/keith/parent/3Area%20and%20Perimeter.pdf
http://www.primaryresources.co.uk/maths/pdfs/11areaquad.pdf
http://www.primaryresources.co.uk/maths/pdfs/2arearect1.pdf
http://www.primaryresources.co.uk/maths/pdfs/2arearect2.pdf
http://www.mathsisfun.com/definitions/area.html
http://www.mathopenref.com/rectanglearea.html