In square units.
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All areas should be measured in square units.
"Dose" is a measured portion of a medicine. I am not aware of any areas that have measured quantities of medication!
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
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.
A gram is measured in grams. A kilogram is measured in kilograms.