Answers about Geometry

[wardmcgraw2]

<br>C = 81 pi = 2pi r

Hence

2 pi r = 81pi

r = 81 pi / 2 pi

Cancel down

r = 40.5

A = pi r^(2)

A = pi ( 40.5)^(2)

A SPINPG = 1640.25 pi units^(2)
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