The perimeter of an octagon is 64 only if it is a regular octagon and the length of one side is 8.
An irregular octagon may or may not have a perimeter of 64 (whatever units of measure you choose to use) depending on what the lengths of the individual sides are.
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The perimeter would be 64 - since 8 x 8 = 64 !
All eight of the octagon's inside angles add up to 1,080 degrees. If it's a regular octagon, then each inside angle is 135 degrees. It doesn't matter if the perimeter is 64 picometers or 64 light years.
64 cm
64cm (8cm x 8 sides = 8 x 8 = 64).
It is the sum of the lengths of the octagon's eight sides.