6.4
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64 cm
64cm (8cm x 8 sides = 8 x 8 = 64).
It is: 8*8*8 = 512 cubic cm
The radius will turn out to be the square root of the area divided by pi which in this case is about 4.51351666838205 cm
8 (measure of each side) x 8 (total sides of an octagon) = 64cm