0.039 metres
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176+176+39+39cm
d = 12.41cm (12.41409cm)
Yes if the dimensions were 3cm by 13cm
390. There are 10 mm in 1 cm, so 39 x 10 = 390.
If the octagon is regular, then one side is 39 and there is 8 side, it will be 39*8The answer is 312 cm squaredIf it isn't a regular octagon, then there is no solution