The answer is 4 feet by 4 feet or 4 x 4 = 16 square feet
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How big is a wall that is 15 square feet?
10 feet times 16 feet = 160 square feet
Its height is also 16 feet because: 0.5*16*16 = 128 square feet
There are two ways to answer your question. If you mean the circle is 16 feet wide (diameter), then the square footage is 201.06 square feet. However, if you mean the circle is 16 feet around (circumference), the square footage will be 20.372 square feet.