Question 691200
The third side cannot be 49 inches long, but you need more information to find the length of the third side.
With the measure of one of the angles, you could find the length of the third side.
Are you missing something from the problem?
Was it a right isosceles triangle (with a right angle)?
Without more information, all you can say is that the length of the third side will be {{{x}}} inches, with
{{{0<x<14}}}.
Here you have two isosceles triangles. All the slanted sides have the same length, but the third side is very long in one triangle, and very short in the other.
{{{drawing(600,150,-0.5,21.5,-1,4.5,
triangle(0.152,0,19.8,0,10,1.736),
triangle(20.8,0,11,1.736,20.8,3.473)
)}}}