About 3,848.45 square units.
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Area of a circle = pi*radius squared
A circle with a radius of 35 feet has an area of 3,848.45 square feet.
That depends on what is meant by a 35 foot circle but the area of a circle is pi times radius squared
The area of a circle with a radius of 14.4 is 651.4
The area of a circle of radius 21 is 1386