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        Q: Why are manhole covers round?
A: A round manhole covering were not able decline through its circular open , a round manhole covering were not able decline through its circular open it is much easier to dig a circular hole , and a round manhole covering is feasible to more easily moved by being rolled 

Q: Why are manhole covers round?
A: The matters of why manhole coverings is typically round , at the very least in the U.S. , was made well-known by Microsoft whenever they first begansking it as a job-interview question . [ 5 ] Originally meant as a psychological assessment of how one approaches an issue with more than one `` 's rights' answering , the problem have drawn up a numbers of alternative explanations , from the practical ( `` Manhole coverings are round because manholes are round . `` ) [ 5 ] to the philosophical .  Reasons for the shape includes  A round manhole covering were not able decline through its circular open , while a squares manhole covering may dropped in if it 's inserted diagonallies in the aperture ( A Reuleaux triangle or another curve of continuous breadth would also serve this objective , but round coverings are considerably simpler to manufacturing . )  Round tubes are most powerful and the majority material-efficient shape against the compression of the earth around them , and therefore it is only natural that the covecircle of a round tubing assume a circular shape .  The bearing surfacing of manhole frames and coverings are machined to guarantee flatness and stop them from becoming dislodged by trafficking . Round casts are considerably simpler to machine using horizontal boring mills .  Circular coverings is not necessary to be rotated to align them when covering a circular manhole .  Human beings have a approximately circular cross-section .  A round manhole covering is feasible to more easily moved by being rolled .  If an auto rolls over a dislodged manhole of another shape , the sharp corners could puncture the auto 's tyre , while a circle does n't have corners .  It is easier to dig a circular hole .  Tradition  Aesthetics  Supply . Most manhole coverings are made by a few huge corporations . If you want a various shape , you will have to pay off more to 've got them custom-made or you will have to make them yourself .  Other manhole shapes is feasible to found , in general squares or rectangles . Nashua , New Hampshire is also possible unique in the U.S. for having tripartite manhole covers that point in the guidance of the underlying flow . The city 's staging out the triangles , which were made by a local foundry , since they 're not huge sufficiently to be fulfilled modern-day standards of safetys , and larger triangles were not able be discovered . [ 1 ] 

Q: Why is a manhole shaped like a circle?
A: It 's so it never decreases were recorded in the hole . The radius of the manhole covering are largeer than the radius of the manhole . Therefore , it is able never dropped in . Any other shape ( square , triangle , decagon , etc . ) can dropped in if manuvered to the accurate angle.. It 's so it never decreases were recorded in the hole . The radius of the manhole covering are largeer than the radius of the manhole . Therefore , it is able never dropped in . Any other shape ( square , triangle , decagon , etc . ) can dropped in if manuvered to the accurate angle .