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.
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A perimeter is not a specific unit of length - it is the distance around an object. Therefore, there is no specific unit called a perimeter.
The question cannot be answered because it makes no sense. The perimeter - of a shape - is the outline of the shape. The is no unit in 20 outlines. Unless you count an outline as a unit and in that case, there are 20.
Centimetre is a unit of length. Perimeter is the size of the border of a polygon. A circle with 1cm ray has Pi perimeter.
any convenient unit of length
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