Like other areas, areas of circles are expressed in units of area.
Some of these are: -- meter2
-- centimeter2
-- millimeter2
-- kilometer2
-- inch2
-- foot2
-- yard2
-- mile2
-- furlong2
-- acre
-- hectare
-- section
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In square units.
All areas should be measured in square units.
Lines are measured with lines. For example, the length of a road is measured with standard lines (linear units) such as yards, miles, meters or kilometers. Areas are measured with areas. A field is measured with standard areas (usually square units) such as square yards, square miles, or square kiometers. Volumes are measured with volumes. A container is measured with standard volumes (often cubic units) such as square inches or square centimeters. Look out for calculations involving linear, square and cubic units. For example, a square measuring three inches on the side has an area of 3 x 3 = 9 square inches. A cubical tank measuring five meters on each side has a volume of 5 x 5 x 5 = 125 cubic meters.
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.
None. Area cannot be measured in length units - only in squares of such units.