Since your circle has a diameter of 9 feet (the definition of a "9 by 9" circle), the radius is half of that distance. In this case, your radius is 4.5 feet or 54 inches.
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If 9 ft is the diameter then 9 pi ~ 28.2743339 If 9 ft is the radius then 18 pi ~ 56.5486678
11 ft * 9ft = 11*9 sq ft = 99 sq ft
9 ft square means a square of 9ft sides. The area will be 81 square feet
9 * 12 = 108 sq ft.
the diameter of a circle with the radius of 9m is 18m