65536. why are you asking this? it's simple.
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Sqrt (256 + 256) = sqrt 64 x sqrt 4 x sqrt 2 = 16 root 2 = just over 22' 7½".
4x4x4x4 = 4^(4) = 256 NB 4x4x4x4 = 16 x 4x 4 = 64 x 4 = 256
16 x 16 = 256
2 root 4 = 2 x 2; -2 to the power 4 is 16 (-2/4/-8/16)
Possible dimensions: 1 x 256, 2 x 128, 4 x 64, 8 x 32 This fits. Perimeter = 2(L + W) = 2 x (8 + 32) = 2 x 40 = 80 m