Divide the diameter by 2, to get the radius. Then you can use the standard formula for the area of a circle. As a reminder, that is:area = pi x radius squared
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If the circle is five feet across - that is the diameter.
A square with an area of five acres has a diameter of 466.7 feet and a diagonal length of 660 feet.
19.63 square feet.
78.54 ft2
The square because its perimeter is 16 inches while the circumference of the circle is 15.708 inches.