Question 777506
According to wolfram alpha (see link below and look at the "possible closed forms" section), one possible representation of 2.16024689946929 is


{{{2.16024689946929 = sqrt(14/3)}}}


You can rewrite that into 


{{{2.16024689946929 = sqrt(42)/3}}}



Link: <a href="http://www.wolframalpha.com/input/?i=2.16024689946929">http://www.wolframalpha.com/input/?i=2.16024689946929</a>