Perimeter is used in several real world situations. For example, if your living room is thirteen feet long and twenty feet wide, you know you can't get a rug whose sides are bigger than 13x20....
Several uses come to mind. For one, the perimeter of a building, multiplied by the wall height gives an estimate of how much paint, siding, sheathing plywood, etc. are needed to do some work. For...
The unit of measurement remains the same whether the shape is regular or irregular. But it does depend on the magnitude of the object whose perimeter is being measured. It could range from light...