The unit can be anything...just make sure to label exactly what the question specifies. It could be centimeters, inches, etc. Also keep in mind for area it is the unit squared. So, for example, if the area was 40 cm, you would put 40 cm2 as your answer.
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If a circle has area of 400 square units then its radius is: 11.25 units.
If the area of a circle is 64 square units the diameter is: 9.027 units.
The radius of the circle is 2 units. * * * * * If the area is 4 units, the radius is 1.128 units
Square units
A circle with a radius of 1.2 units has an area of 4.52 square units.