steves@tekgen.BV.TEK.COM (Steve Shellans) (07/22/88)
In article <1550@tekirl.TEK.COM> jackg@tekirl.TEK.COM (Jack Gjovaag) writes: >In article <303@btree.uucp> rfarris@btree.UCSD.EDU (rick farris) writes: >> >>Yes, and why the heck are manholes round? > >Aha! I know the answer to this one, even though it has nothing to >do with electronics. Round is the only shape for the cover that >guarantees that the cover can't fall into the hole. What do I win? You win a free plane geometry textbook. Three-cusp hypocycloids have the same property. Although they are not round, they have a constant diameter when measured at any angle of rotation. Steve Shellans Tektronix, Beaverton OR tektronix!tekgen!steves