The side length is the diameter multiplied by tan22.5. S=Dtan22.5
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perimeter of octagon is 128 cm= 8 * side side of the octagon=128/8=16 cm
You cannot figure out the length of an octagon without a lot more information. Alternatively, you can measure the lengths of the sides.
the length of a side is x. (3x)(x)
If a regular octagon has a perimeter of 40cm, then each side is 5 cm.
The side length is 1.82 units.