a square one
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5.7 km
There are infinitely many. Calculate the square root of 250, and round it up. The square of this number will be the first one. The square of any larger integer will also be a perfect square larger than 250.
Round manholes provide access to underground utilities or passages. The heavy round cover just fits into a heavy ring. Things could be square or rectangular, but with a round cover, the cover cannot fall into the hole in any position. With a square or rectangular cover, there is a way to situate the cover so it partially covers the hole and then can fall in. Not so with the circular one.
yes because bigger ones get a lot of wind speed who make them move fast but the smaller one can't not movee at the wind speed