To find out if three lengths are the sides of a triangle we need to remember that the triangle inequality theorem. This theorem states that: the sum of two side lengths of a triangle is always greater than the third side.
This means that:
[tex]a+b>c[/tex]For the lengths a=13 b=13 and c=1 we notice that:
[tex]\begin{gathered} 13+13>1 \\ 26>1 \end{gathered}[/tex]This means that this lengths can be the side of a triangle.
This triangle is an acute, isosceles triangle.
