Approx 566.9 square inches.
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Area = π * r2 = π * 142 = 196π in2
The area is 1583 square units, approx.
A regular nonagon with a side length of 9 has an apothem of 12.4 not 16. So the question is inconsistent.
55.6 cm^2 approx.
210 in 2