Something else you did not know

Kyteland

Diamond Member
Dec 30, 2002
5,747
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Circles aren't the only shape that can be used as manhole covers. There is another class of shapes that have constant diameters, one being the Rouleaux Triangle.

They are superior to circles as manhole covers in that they will not rattle when cars drive over them. Circles are superior in that for a given diameter they have a larger area then the Rouleaux Triangle, which is disadvantageous when an emergency worker must enter wearing an air tank.

So the next time someone asks you this question at an interview you can imress them with this information.
 

memo

Golden Member
Jul 16, 2000
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to impress them i'd have to figure out how to pronounce that first. :) ROW-LEW Triangle?