140.4 square units.
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Using 3.14 as Pi the area of circle is: 0
The radius of a circle if its circumference is 42 is about 6.68
Area of a circle = pi*radius2 Area = pi*212 = 1385.44236 square units
A circle with a radius of 42 feet has a circumference of 263.89 feet.
The area of a circle is pi times the square of the radius: A = πr2. For a circle of radius 4, this is π x 42 = π x 16 = 50.265 units squared.A circle with a radius of 4 units has an area of 50.27 square units.