None.
Area cannot be measured in length units - only in squares of such units.
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Length squared
The length, width, or height of a solid figure is measured in units of length. The area of the figure's outside surfaces is measured in squared units of length. The volume of space filled by the figure is measured in cubed units of length. The mass of the figure is measured in units of mass. The weight of the object is measured in units of force. The age of the figure is measured in units of time. etc.
Perimeter is a length, not an area or volume...
Area is defined as the length multiplied by the width of a section of space, the units depend on what notation you are using. Area can be measured in squared inches, squared feet, squared miles, acres, hectacres, meters, kilometers...etc. As you can see area can be measured in any units that measure length.
It is: cross-section area*length and measured in cubic units