That means a radius of 5.
Using the standard circular area formula (Pi * r ^ 2), the resulting area is exactly 25 * Pi.
Using a numerical estimate for Pi, the area is about 78.5398.
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Area of the circle is about 10 square units
78.53981634 square units
If 10 diameter means 10 ft diameter then the area is 78.54 sq.ft.
Using 3.14 as Pi the area of circle is: 78.5
Area of the circle = pi*radius2 = pi*52