Question 535807
Let's say we have the triangle with sides a, b, and c, where a = 31cm., b = 85cm., and side c is to be determined.
Side c cannot be shorter than or equal to the difference of sides a and b, so...
{{{c > b-a}}}
{{{c > 85-31}}}
{{{c > 54}}}
The shortest that side c can be is 55cm.
Also, side c cannot be longer than or equal to the sum of sides a and b, so...
{{{c < a+b}}}
{{{c < 31+85}}}
{{{c < 116}}} 
The longest that side c can be is 115cm.