Question 499108
If {{{a^2}}} + {{{b^2}}} < {{{c^2}}}, the angle is acute.
If {{{a^2}}} + {{{b^2}}} < {{{c^2}}}, the angle is obtuse.
{{{a^2}}} + {{{b^2}}}  = {{{c^2}}}
{{{a^2}}} + {{{b^2}}}  = 676, 
{{{sqrt(676)}}} = 26
So, the third side must be < 26.
Cleomenius.