Area and Perimeter Lesson on Perimeter of Polygons http://www.mathgoodies.com/lessons/vol1/perimeter.html         Provides in depth explanation of perimeter, then gives practice problems.  Have students bring paper and pencil with them to the lab for this one!  Make sure they read carefully! Shape Surveyor http://www.funbrain.com/poly/index.html         A funbrain game.  Students can play just area or perimeter, or do a mixed review. Area Explorer http://www.shodor.org/interactivate/activities/AreaExplorer/         Teaches the relationship between area and perimeter.  Students see how area can change even though the perimeter stays the same.  You can adjust the perimeter and click Draw New Shape to make different areas. Perimeter Explorer http://www.shodor.org/interactivate/activities/PerimeterExplorer/         Similar to the activity above, but the area stays the same while the perimeter changes. Shape Explorer http://www.shodor.org/interactivate/activities/ShapeExplorer/         Students fill in the area and perimeter of the given shape. Area and Perimeter http://www.bgfl.org/bgfl/custom/resources_ftp/client_ftp/ks2/maths/perimeter_and_area/index.html         Students practice finding the area or perimeter of different shapes.  3 levels for each. Math Playground - Area and Perimeter http://www.mathplayground.com/area_perimeter.html         An interactive math lesson on finding area and perimeter. Geoboards http://www.mathplayground.com/geoboard.html         An interactive geoboard.