Answers about Geometry
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C = 81 pi = 2pi r
Hence
2 pi r = 81pi
r = 81 pi / 2 pi
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สล็อตเว็บตรง r = 40.5
A = pi r^(2)
A = pi ( 40.5)^(2)
A = 1640.25 pi units^(2)
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