Question 310867
I don't see a diagram. 
If {{{a}}} is the longest side, then
{{{ a^2=b^2+c^2=81+256=337}}}
{{{a=sqrt(337)}}}
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If {{{a}}} is not the longest side, then
{{{c^2=a^2+b^2}}}
{{{a^2=c^2-b^2=256-81=175}}}
{{{a=5*sqrt(7)}}}