To compare 9 1/2 feet and 112 inches, you have to convert them to the same units; in this case, to inches. 9 1/2 feet equals 9 feet 6 inches, so multiply 9 by 12 (12 inches are in a foot) and add the 6 inches. 9 x 12 + 6 = 114 inches.
Since 114 inches is more than 112 inches, 9 1/2 feet is more than 112 inches.
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3 yards is 9 feet. 3 yards is 108 inches.
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.
9' x 9' = 81 square feet.
It is 9+16+9+16 = 50 feet
9 × 9 = 81 square feet