Question 34413
If you are refering to the pythagorean theorem: {{{a^2+b^2=c^2}}} {{{11^2+b^2=61^2}}}   {{{sqrt(11^2+b^2)=sqrt(61^2)}}}   {{{11+b=61}}}{{{11-11+b=61-11}}}  {{{b=50}}}

Hope this helps,
lyra

P.S. In the future please be more detailed in writing your problem.