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The perimeter of a plane figure is the length of its boundary.

Also defined as

By extension of its definitions as the length of its boundary, the term perimeter is frequently used (some would argue erroneously) to mean the boundary itself.

Also see

  • Results about perimeters can be found here.

Linguistic Note

The word perimeter derives from the Greek peri (meaning around) and meter (meaning measure).

Hence its literal translation is measure around.

It is pronounced with the emphasis on the second syllable: pe-rim-e-ter.