Perimeter in a sentence

(The perimeter is the outside length around an object other than circular ones. It can also mean a guarded area around a location.)

For quadrilaterals, the perimeter is twice the length plus twice the width.

The garden club planted flowers around the perimeter of the plaza.

The police set up a perimeter around the crime scene to search for the suspect.

There are constant patrols around the perimeter of the army base.