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Surface area of regular polygon with number and length of sides known is:

s2 / A = 4/n * tan 180/n

where s = length of side and n = number of sides

so

9/A = 4/5 * tan 180/5

9/A = 4/5 * tan 36

9/A = 0.58123

A = 9/0.58123 = 15.4843 sq. inches

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