what is the length of each side of an octagon with a diameter of 30?

length of each side of an octagon with a diameter of 30
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If the diameter is 30 units the radius is 15. A regular octagon can be constructed from 8 isosceles triangles with equal sides length 15. The vertex angle is 45°. Half the length of the side of the octagon is 15sin(22.5°)=5.74 approx, so the side length is 11.48.

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