SOLUTION: How do you find the lateral area of a regular polygon?

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Question 292588: How do you find the lateral area of a regular polygon?
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
n = # of sides
s = length of sides
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Area+=+%28%28ns%5E2%29%2F4%29%2Acot%28180%2Fn%29
I'm not sure how "lateral area" applies to a plane figure.