SOLUTION: What is the area and perimeter of an octagon with a radius of 11? I have tried (1/4)* sqrt3 (s^2) but am not sure.

Algebra ->  Polygons -> SOLUTION: What is the area and perimeter of an octagon with a radius of 11? I have tried (1/4)* sqrt3 (s^2) but am not sure.       Log On


   

Question 867568: What is the area and perimeter of an octagon with a radius of 11?
I have tried (1/4)* sqrt3 (s^2) but am not sure.
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
What is the area and perimeter of an octagon with a radius of 11?
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It's 8 isoceles triangles with 2 sides = 11 and a central angle of 45 degs
--> 16 right triangles
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Area+=+nR%5E2%2Asin%28360%2Fn%29%2F2
= 8%2A121%2Asin%2845%29%2F2
= 242*sqrt(2) sq units
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