The radius would be 4 feet I know this because the diameter is always 2x the size of the radius.
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If the radius is 8 feet then the diameter will be 16 feet.
Circle with a radius of 8 feet equals a circle with a diameter of 16 feet.
16 ft. (d = 2r)
The area of a circle can be found using the formula A = πr^2, where r is the radius of the circle. Since the diameter is given as 8 feet, the radius would be half of the diameter, which is 4 feet. Plugging this into the formula, the area of the circle is approximately 50.27 square feet.
8 inches; the diameter of a circle is twice its radius.