FTimes 100
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Assuming that a 100 ft circle is one with a diameter of 100 ft (ie radius of 50 feet), area = pi*502 = 1963.5 sq feet
If radius=21 ft, then diameter = 2*radius = 42 ft
Assuming the 100 ft refers to the diameter, radius = 50 feet. Area = pi*r2 = pi*2500 = 7853.98 sq ft (approx).
Radius of a circle = 1/2 of the diameter.Area of a circle = (pi) x (radius)2For the diameter of 16-ft, radius = 8-ft, and area = (pi) (8)2 = 201.062 square feet (rounded)
The radius of a circle is half the diameter → radius = ½ × 12 ft = 6 ft.