7850 sq ft. Formula is pi x R squared. Diameter of 100 means Radius (r) is 50. 50 squared (multiplied by itself) is 25000. Multiply THAT by the value of pi- or 3.14, and you get 7850 sq ft.
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The area of a circle = (pi) x radius squared radius = 1/2 diameter 3.14 x 5 feet squared 3.14 x 25 = 78.5 square feet
Area = pi R2 = 100 pi = 314.16 square feet (rounded)
The diameter of a circle whose circumference is 314 is about 1 (99.95).
It is 100 units.
The formula for the area (A) of a circle is A = πr2. If the area is 100π then 100π = πr2 : 100 = r2 : r = √100 = 10. The radius is of length 10 units.