View All num of num See all Photos Microsoft This employer has taken extra steps to respond to reviews and provide job seekers with accurate company information, photos, and reviews. Interested for your company?Learn More. www.microsoft.com Employer Engaged Overview Reviews Salaries Interviews Jobs Photos Benefits 9.2k Reviews 32k Salaries 4.0k Interviews Follow Add Review or Salary Follow Add Review or Salary 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 2012-07-02 ▲ 0 ▼ What about an equilateral triangle. That also cannot fall in on itself. Thomas on 2013-02-05 ▲ 0 ▼ Sorry, the Reuleaux triangle Thomas on 2013-02-05 Add Answers or Comments To comment on this, Sign In or Sign Up.