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If you know a side length, s, the perimeter is 8 s
If you know the circum radius, r, (the distance from the center to a vertex) , the perimeter is
p = 8 r sqrt(2 - sqrt(2)) (approx 6.12 r)

If you know the apothem, a, (the distance from the center to the middle of a side),
p = 16 a sqrt(2-sqrt(2))/sqrt(sqrt(2)+2) (approx 6.63 a)

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14y ago
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Q: What is the perimeter of a regular octagon?
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