Question 858840
What one are you asking:  {{{sqrt(169/49)}}}  or {{{sqrt(169)/49}}} ?
Most of the time, people only learn the squares for whole numbers up to 12.  You can go farther.  {{{13*13=169}}};  {{{14*14=196}}}.  


The fraction should not throw you off.  In case, {{{sqrt(1/d^2)=1/d}}}.