The area of a circle is Pi X Radius squared. You can use the Pi button on your scientific calculator to get the closest answer possible, or you can use 3.14, which is what will be used here (and is usually a couple tenths off).
The exact answer would be 16(Pi) units squared, but the rounded answer would be 50.24 units squared.
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The area of a circle with a radius of 4 is: 50.27 square 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.
The area of a circle with a radius of 4 feet is: 50.27 square feet.
A circle has only one measure for its radius. A shape that has a "radius" of 3 in by 4 in cannot be a circle.