Hammer a wooden peg and attach an 8 foot thin rope to the peg. Fasten a spike on the other end (to scrape the circle on the ground). After ensuring the distance between the centre peg and the spike is 8 feet in length, keeping the rope taut, use the spike to mark the ground in a circle.
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A 16-foot circle has an area of 201.06 square feet.
Area of any circle is: pi times radius squared
It is 5.1 feet, approx.
Area of the circle: pi*8^2 = 201 square feet rounded
The radius is the line from the center to the outside of the circle, therefore the width of a circle is twice the radius. 2 x 8 feet =16 feet