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 years for galaxies, to kilometres for a town, to metres for a house to Angstrom units for atomic structures.
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The perimeter is a measurement of the distance around the outline of a shape. The area is the measurement of all the space within the shape, and it is measured as (unit) 2
It must be a perimeter. An area measurement would a square measurement like 56cm². ■
A regular nonagon has 9 sides and so its perimeter is 9*40 = 36 units of measurement
Perimeter = sum of the lengths of the sides.
A kilometre is a metric unit for measuring distance. A perimeter is the length of the boundary of a plane figure, which can be measured in inches, miles, kilometres or any other unit for measuring distance.