1 acre = 43,560 ft2 so ...
480 ft2 ÷ 43560 ft2/acre = 480/43560 = 0.11 acres
You can visualize that better as a rectangle 24 ft wide and 20 ft long.
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How big is a wall that is 15 square feet?
480 sq ft
Depending on what "a circle of 480 feet" means, the radius will have different values. If the radius is 480 feet, then that is your answer. If the diameter is 480 feet, then its radius is 480/2 = 240 feet. If the circumference is 480 feet, then its radius is 480/2(pi) = 240/(pi) = 76.39 feet.
Six square feet.
43,560 square feet.