Area of a circle = pi*radius2
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The area of a circle with a 13 ft diameter is: 132.7 square feet.
If the circle is 20 ft radius, the area is π·20² = 1256.637 ft² If the circle is 20 ft diameter, the area is π·(20/2)² = 314.1593 ft² If the circle is 20 ft circumference, the are is π·(20/2π)² = 63.66198 ft²
surface area is lateral area
Using 3.14 as Pi the area of circle is: 0
The area of a 5 foot circle is: 19.63 square feet.