Chat with our AI personalities
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.
The answer depends on how large a bookcase you have!
80 sqf (length times width)
It depends on the size of the sheets that you get!
A circular cover is the only shape that can fit the hole no matter which way you drop it, but can't possibly fall through the hole no matter which way you drop it.