If you mean: (1, 1) (1, 4) (4, 4) and (4,1) then by using the distance formula the perimeter is 3+3+3+3 = 12 units
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Count the squares around the rectangle... Simple as that!
Perimeter almost always has a unit, which is the same as that of the lengths given by the question. The only case I can think of where no unit is necessary is when the question uses a coordinate plane.
a coordinate system is lines of longuitude and latitude that are used in a map to locate something. There is a coordiante in the Equatorial Coordinate System that is like longitude in the Geographical Coordinate System.....what is the coordinate? Celestial Equator?
The perimeter of the square is 96.
Coordinate index ? Sure ! It's easy ... You just have to coordinate your index number !