perimeter
Definitions
The continuous line forming the boundary of a closed geometric figure.
The total distance around the outside of a two-dimensional shape.
The outermost limits or boundaries of an area or object.
Examples
The security guards patrolled the entire perimeter of the building to ensure everyone's safety.
To calculate the perimeter of the rectangular garden, you must add the lengths of all four sides.
The soldiers were ordered to secure the perimeter before the rest of the convoy arrived.