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 Perimeter:  The sum of the lengths of the sides of a polygon.

Archimedes and the Computation of Pi: Read about how Archimedes computed the value of Pi using circumscribed and inscribed polygons (includes an interactive applet).

Perimeter Problems: Here you can find some practice problems with perimeter.

More Perimeter Problems: Here you can find more practice problems with perimeter.

Download: Download a game to practice with perimeter (note: Mac only).