View All num of num See all Photos Microsoft www.microsoft.com Engaged Employer Overview Reviews Salaries Interviews Jobs Photos Benefits 9.6k Reviews 32k Salaries 4.1k Interviews Follow Add Interview Follow Add Interview Interview Question Product Unit Manager Interview Microsoft Why is a Manhole cover round? Tags: See more , See less 8 Answer Add Tags Answer Interview Answer 3 Answers ▲ 0 ▼ It is the only shape that by design cannot fall into itself. Interview Candidate on 02-Jul-2012 ▲ 0 ▼ What about an equilateral triangle. That also cannot fall in on itself. Thomas on 05-Feb-2013 ▲ 0 ▼ Sorry, the Reuleaux triangle Thomas on 05-Feb-2013 Interviews > Product Unit Manager > Microsoft Add Answers or Comments To comment on this, Sign In or Sign Up.