Square units
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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
The area of a circle with a radius of 4 units is: 50.27 square units.
A circle with a radius of 1.2 units has an area of 4.52 square units.