Interview question itseems, haha

Images 1 and 2 hint at a legendary nonsense question often asked in Interviews.

square-manhole

ManholeCover

Who is the mechanical engineer shown in the pic, and how does he fit into this equation?

Update: Don’t give me the funda for the two manholes, Just use that funda to think how the engineer is involved with this problem.

engineer

———
Cracked by Capt Vogon Jeltz & YaavanoObba (on twitter)

Answer:

This is Franz Reuleaux and the Reuleaux triangle.

Any curve of constant width ( a circle, for example) can be used as an ideal manhole cover. So these are the only two 2-d surfaces that quallify.

The interview question made famous by Microsoft was along ‘lateral thinking’ lines, asking why square covers can’t be used instead.

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4 thoughts on “Interview question itseems, haha

  1. Ajay Parasuraman says:

    Why man-hole covers are circular in shape? It’s because it’s the only shape in which the cover doesn’t fall into the hole.

  2. Anirudh says:

    Don’t know the engineer’s name but the pics, i think is about why manhole covers are round and not any other shape. If the manhole covers are any other shape then there is good chance that the lid will fall into the manhole, which is not possible if the lid is circular in shape

  3. Capt Vogon Jeltz says:

    Franz Reuleaux and the Reuleaux triangle. A possible explanation for the (in?)famous Microsoft interview question about why manhole covers are round.

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