- (mathematics) The sum of the distance of all the lengths of the sides of an object.
- The outer limits of an area. See Synonyms at circumference.
- (mathematics) The length of such a boundary.
- A fortified strip or boundary usually protecting a military position.
- An instrument for determining the extent and shape of the field of vision.
| Pictures Needed!!!
This article is in need of pictures. Pictures make this site more interesting and informative. you can add a picture to a article here